user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: what is the second percy jackson book called? 
Knowledge Triplets: The Last Olympian, book.book.genre, Fantasy
Percy Jackson, theater.theater_character.portrayed_by, m.011dw_ym
The Lightning Thief, freebase.valuenotation.is_reviewed, Country of origin
The last king of Texas, book.written_work.author, Rick Riordan
m.0646ff6, film.performance.character, Sally Jackson
Rick Riordan, film.film_story_contributor.film_story_credits, Percy Jackson: Sea of Monsters
The Titan's Curse, book.book.editions, The Titan's Curse
The Demigod Files, book.written_work.original_language, English Language
The Lightning Thief, theater.play.characters, Clarisse
The Lightning Thief, book.book.characters, Grover Underwood
The Sea of Monsters, book.book.characters, Annabeth Chase
Rick Riordan, book.author.book_editions_published, The Lightning Thief (Percy Jackson and the Olympians, Book 1)
The Battle of the Labyrinth, book.book.genre, Speculative fiction
The Lost Hero, book.book.characters, Frank Zhang
The Son of Neptune, book.written_work.previous_in_series, The Lost Hero
Book, freebase.type_hints.included_types, Topic
The Sea of Monsters, common.topic.notable_for, g.125ckpj49
The Demigod Files, book.book.genre, Fantasy
The Demigod Files, book.written_work.part_of_series, Percy Jackson & the Olympians
Rick Riordan, book.author.book_editions_published, The Lightning Thief: Percy Jackson and the Olympians
Rick Riordan, book.author.works_written, The Demigod Diaries
Rick Riordan, common.topic.article, m.026r5z1
Rick Riordan, book.author.works_written, The Serpent's Shadow
The Mark of Athena, common.topic.notable_types, Book
Percy Jackson, book.book_character.appears_in_book, The Last Olympian
The Demigod Files, common.topic.notable_types, Book
The Lightning Thief, common.topic.notable_for, g.1255tplym
The Devil Went Down to Austin, book.book.editions, The Devil Went Down to Austin
Annabeth Chase, book.book_character.appears_in_book, The Sea of Monsters
The Titan's Curse, common.topic.notable_for, g.1257p9qlq
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Annabeth Chase
The Lightning Thief, book.written_work.author, Joe Tracz
Greek mythology, film.film_subject.films, Percy Jackson & the Olympians: The Lightning Thief
The Mark of Athena, book.book.characters, Ella
Author, type.type.expected_by, Playwright
Author, freebase.type_profile.strict_included_types, Topic
Rick Riordan, book.author.works_written, The Blood of Olympus
The Last Olympian, freebase.valuenotation.is_reviewed, Date of first publication
m.0d31rqm, film.performance.character, Percy Jackson
Percy Jackson & the Olympians: The Lightning Thief, film.film.language, English Language
Demigod, fictional_universe.character_species.characters_of_this_species, Percy Jackson
The Battle of the Labyrinth, book.written_work.author, Rick Riordan
The Lost Hero, book.written_work.part_of_series, Camp Half-Blood Chronicles
The Lost Hero, book.book.characters, Thalia Grace
The Mark of Athena, book.written_work.original_language, English Language
The Sea of Monsters, freebase.valuenotation.has_value, Date written
The Lightning Thief, book.book.genre, Fiction
The Mark of Athena, book.book.characters, Nico di Angelo
The Last Olympian, book.book.characters, Percy Jackson
The Last Olympian, book.written_work.part_of_series, Camp Half-Blood Chronicles
Rick Riordan, book.author.works_written, g.11bv302bjr
m.09wvkwq, common.webpage.topic, Rick Riordan
Percy Jackson: Sea of Monsters, media_common.adaptation.adapted_from, The Sea of Monsters
The Lost Hero, book.book.genre, Fantasy
The Lightning Thief, book.book.editions, The lightning thief
Rick Riordan, book.author.works_written, Percy Jackson and the Singer of Apollo
The Titan's Curse, common.topic.notable_types, Book
Rick Riordan, book.author.series_written_or_contributed_to, Camp Half-Blood Chronicles
Rick Riordan, book.author.works_written, The Demigod Files
Percy Jackson, freebase.valuenotation.is_reviewed, Portrayed By (In Plays)
Author, people.profession.corresponding_type, Author
Rick Riordan, book.author.book_editions_published, The lightning thief
The Lightning Thief, book.book.characters, Sally Jackson
The Lost Hero, book.book.characters, Jason Grace
Novelist, people.profession.corresponding_type, Author
The Battle of the Labyrinth, book.book.genre, Fiction
The Lightning Thief, book.book.characters, Chiron
Tyson the Cyclops, fictional_universe.fictional_character.appears_in_these_fictional_universes, Percy Jackson & the Olympians
Annabeth Chase, book.book_character.appears_in_book, The Son of Neptune
The Titan's Curse, freebase.valuenotation.is_reviewed, Date of first publication
The Mark of Athena, book.written_work.next_in_series, The House of Hades
The Lightning Thief, book.book.editions, The Lightning Thief (Percy Jackson and the Olympians, Book 1)
Rick Riordan, book.author.book_editions_published, Cold Springs
Tyson the Cyclops, book.book_character.appears_in_book, The Sea of Monsters
Percy Jackson: Sea of Monsters, film.film.language, English Language
Playwright, rdf-schema#range, Author
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Ethan Nakamura
Percy Jackson, common.topic.notable_for, g.1257qk37q
The Lost Hero, book.book.characters, Percy Jackson
Percy Jackson, film.film_character.portrayed_in_films, m.0d31rqm
Rick Riordan, book.author.works_written, Cold Springs
The Battle of the Labyrinth, book.book.genre, Young-adult fiction
The Lost Hero, book.book.characters, Grover Underwood
The Sea of Monsters, book.written_work.original_language, English Language
Percy Jackson, common.topic.article, m.02rd1tx
Percy Jackson, book.book_character.appears_in_book, The Sea of Monsters
m.0646ffc, film.performance.film, Percy Jackson & the Olympians: The Lightning Thief
The Mark of Athena, book.written_work.part_of_series, The Heroes of Olympus
The Son of Neptune, common.topic.article, m.0dlnqh7
The Lightning Thief, book.written_work.subjects, Classics
Rick Riordan, book.author.works_written, Percy Jackson and the Olympians: The Ultimate Guide
Water Manipulation, fictional_universe.character_powers.characters_with_this_ability, Percy Jackson
Fictional Universe, freebase.type_profile.published, Published
The Last Olympian, book.written_work.original_language, English Language
Rick Riordan, book.author.works_written, Southtown
The Son of Neptune, book.book.characters, Hazel Levesque
The Battle of the Labyrinth, freebase.valuenotation.is_reviewed, Date of first publication
Percy Jackson, fictional_universe.fictional_character.appears_in_these_fictional_universes, Percy Jackson & the Olympians
Percy Jackson, film.film_character.portrayed_in_films, m.0646ffc
Percy Jackson, book.book_character.appears_in_book, The Sea of Monsters
The Sea of Monsters, book.written_work.previous_in_series, The Lightning Thief
The Sea of Monsters, common.topic.article, m.026jlkd
The Titan's Curse, book.written_work.previous_in_series, The Sea of Monsters
The Lost Hero, book.book.characters, Leo Valdez
The Son of Neptune, freebase.valuenotation.is_reviewed, Date of first publication
The Titan's Curse, book.book.genre, Speculative fiction
The Mark of Athena, book.book.characters, Thalia Grace
Percy Jackson & the Olympians, fictional_universe.fictional_universe.literary_series_set_here, Percy Jackson & the Olympians
The Mark of Athena, book.book.genre, Romance novel
Rick Riordan, book.author.series_written_or_contributed_to, The 39 Clues
Percy Jackson: Sea of Monsters, film.film.genre, Fantasy
The Sea of Monsters, freebase.valuenotation.is_reviewed, Date of first publication
The Sea of Monsters, book.written_work.subjects, Adventure
Perseus, common.topic.notable_for, g.1259jvlks
Rick Riordan, book.author.works_written, Vespers Rising
Percy Jackson & the Olympians: The Lightning Thief, media_common.netflix_title.netflix_genres, Fantasy
The Sea of Monsters, book.written_work.part_of_series, Camp Half-Blood Chronicles
The Sea of Monsters, book.book.editions, The Sea of Monsters (Percy Jackson and the Olympians, Book 2)
The Lightning Thief, book.written_work.next_in_series, The Sea of Monsters
Camp Half-Blood Chronicles, common.topic.notable_for, g.125b_vtx3
m.0g4yh8y, common.webpage.topic, Rick Riordan
Rick Riordan, book.author.series_written_or_contributed_to, Tres Navarre (non-genre mystery series)
Percy Jackson: Sea of Monsters, film.film.starring, m.0d31rqm
The Titan's Curse, book.book.characters, Percy Jackson
Author, freebase.type_hints.included_types, Topic
Rick Riordan, book.author.works_written, The Mark of Athena
Percy Jackson: Sea of Monsters, film.film.country, United States of America
Percy Jackson & the Olympians: The Lightning Thief, film.film.genre, Fantasy
Fictional Character, freebase.type_profile.published, Published
Rick Riordan, book.author.book_editions_published, The Battle of the Labyrinth (Percy Jackson and the Olympians, Book 4)
Rick Riordan, book.author.works_written, g.11dykh14_
Cold Springs, book.written_work.author, Rick Riordan
Rick Riordan, book.author.book_editions_published, The Titan's Curse (Percy Jackson and the Olympians, Book 3)
The Last Olympian, book.written_work.author, Rick Riordan
The Battle of the Labyrinth, book.written_work.original_language, English Language
The Sea of Monsters, book.written_work.part_of_series, Percy Jackson & the Olympians
The Sea of Monsters, common.topic.notable_types, Book
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Tyson the Cyclops
The Mark of Athena, book.book.characters, Frank Zhang
The Titan's Curse, freebase.valuenotation.is_reviewed, Author
Playwright, type.property.delegated, Author
Perseus, symbols.name_source.namesakes, Percy Jackson
The Lightning Thief, media_common.adaptation.adapted_from, The Lightning Thief
Percy Jackson, fictional_universe.fictional_character.parents, Poseidon
Rick Riordan, book.author.works_written, The Son of Sobek
Camp Half-Blood Chronicles, common.topic.article, m.076vcmc
The Last Olympian, book.book.genre, Greek mythology
The Lost Hero, book.book.genre, Greek mythology
Rick Riordan, film.film_story_contributor.film_story_credits, Percy Jackson & the Olympians: The Lightning Thief
Writer, people.profession.specializations, Author
The Devil Went Down to Austin, book.book.genre, Speculative fiction
The Mark of Athena, book.book.genre, Greek mythology
Cold Springs, book.written_work.original_language, English Language
Perseus, common.topic.article, m.01drlj
Play, type.type.properties, Composer
Sally Jackson, common.topic.notable_for, g.125dz71wc
Author, freebase.type_profile.equivalent_topic, Author
The Sea of Monsters, book.book.genre, Young-adult fiction
The Devil Went Down to Austin, book.written_work.part_of_series, Tres Navarre (non-genre mystery series)
Rick Riordan, book.author.book_editions_published, The Battle of the Labyrinth
Rick Riordan, book.author.book_editions_published, The Lightning Thief
The Lightning Thief, freebase.valuenotation.is_reviewed, Date of first publication
The Sea of Monsters, book.book.editions, Percy Jackson and the Sea of Monsters
Percy Jackson, book.book_character.appears_in_book, The Mark of Athena
Percy Jackson: Sea of Monsters, film.film.prequel, Percy Jackson & the Olympians: The Lightning Thief
The Battle of the Labyrinth, book.book.characters, Percy Jackson
Percy Jackson: Sea of Monsters, film.film.story_by, Rick Riordan
The Lightning Thief, media_common.adapted_work.adaptations, The Lightning Thief
The Son of Neptune, book.written_work.author, Rick Riordan
The Last Olympian, book.written_work.previous_in_series, The Battle of the Labyrinth
Percy Jackson, theater.theater_character.plays_appears_in, The Lightning Thief
The Mark of Athena, book.book.characters, Octavian
Rick Riordan, book.author.works_written, The Sword of Summer
Play, type.type.properties, Genre
The Son of Neptune, book.written_work.part_of_series, The Heroes of Olympus
Percy Jackson & the Olympians: The Lightning Thief, film.film.country, United States of America
The Son of Neptune, book.written_work.next_in_series, The Mark of Athena
The Lightning Thief, book.written_work.author, Rick Riordan
The Lightning Thief, book.written_work.subjects, Friendship
Rick Riordan, book.author.series_written_or_contributed_to, Percy Jackson & the Olympians
The Lightning Thief, freebase.valuenotation.has_no_value, Previous in series
Writer, people.profession.specializations, Novelist
The Battle of the Labyrinth, common.topic.notable_for, g.12573509t
m.0b46k9d, common.webpage.topic, Rick Riordan
Sally Jackson, common.topic.article, m.03qnpkm
The Sea of Monsters, book.book.characters, Grover Underwood
The Lightning Thief, book.written_work.part_of_series, Percy Jackson & the Olympians
The Battle of the Labyrinth, book.book.genre, Fantasy
The Titan's Curse, book.book.editions, The Titan's Curse (Percy Jackson and the Olympians, Book 3)
Rick Riordan, common.topic.notable_for, g.1257t8zt2
The Lightning Thief, common.topic.article, m.0fpgc7
The Titan's Curse, book.book.genre, Fantasy
The Lost Hero, freebase.valuenotation.is_reviewed, Date of first publication
Percy Jackson, book.book_character.appears_in_book, The Demigod Files
The Lightning Thief, media_common.adapted_work.adaptations, Percy Jackson & the Olympians: The Lightning Thief
Sally Jackson, fictional_universe.fictional_character.gender, Female
The Son of Neptune, book.written_work.part_of_series, Camp Half-Blood Chronicles
Rick Riordan, book.author.book_editions_published, The Sea of Monsters (Percy Jackson and the Olympians, Book 2)
Percy Jackson, common.topic.article, m.05f3xq2
m.09wcxbz, common.webpage.topic, Rick Riordan
The Lost Hero, common.topic.notable_types, Book
The Devil Went Down to Austin, common.topic.notable_types, Book
The Demigod Files, book.book.genre, Young-adult fiction
Sally Jackson, common.topic.notable_types, Film character
Rick Riordan, book.author.works_written, The Sea of Monsters
The Son of Neptune, book.book.genre, Young-adult fiction
Percy Jackson, fictional_universe.fictional_character.species, Demigod
The Son of Neptune, book.book.genre, Greek mythology
The Son of Neptune, common.topic.notable_types, Book
The Demigod Files, book.book.genre, Short story
Cold Springs, book.book.editions, Cold Springs
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Grover Underwood
m.0b46br6, common.webpage.topic, Rick Riordan
The Sea of Monsters, book.book.genre, Adventure fiction
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Percy Jackson
Rick Riordan, book.author.series_written_or_contributed_to, The Heroes of Olympus
Rick Riordan, book.author.series_written_or_contributed_to, The Kane Chronicles
Book, freebase.type_profile.published, Published
Rick Riordan, book.author.book_editions_published, Mission Road
Mission Road, book.book.genre, Fiction
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Nico di Angelo
Author, freebase.equivalent_topic.equivalent_type, Author
Sally Jackson, book.book_character.appears_in_book, The Lightning Thief
Fantasy, media_common.media_genre.parent_genre, Speculative fiction
Rick Riordan, book.author.works_written, g.1z3t2l52z
Annabeth Chase, fictional_universe.fictional_character.appears_in_these_fictional_universes, Percy Jackson & the Olympians
m.0646ffc, film.performance.character, Percy Jackson
The Mark of Athena, book.written_work.author, Rick Riordan
Play, freebase.type_profile.published, Published
The Son of Neptune, book.written_work.original_language, English Language
Mission Road, common.topic.notable_types, Book
Rick Riordan, book.author.book_editions_published, The Widower's Two-Step
The Mark of Athena, book.book.editions, The Mark of Athena
Rick Riordan, book.author.works_written, Big Red Tequila
Percy Jackson, book.book_character.appears_in_book, The Titan's Curse
The Mark of Athena, book.book.characters, Reyna Avila Ramírez-Arellano
The Lost Hero, book.book.characters, Hera
The last king of Texas, book.book.genre, Speculative fiction
Sally Jackson, film.film_character.portrayed_in_films, m.0646ff6
Percy Jackson, book.book_character.appears_in_book, The Lightning Thief
The Lightning Thief, book.book.genre, Speculative fiction
The Sea of Monsters, book.book.characters, Tyson the Cyclops
The Titan's Curse, common.topic.article, m.0263qvc
The Titan's Curse, book.book.genre, Fantasy literature
The Titan's Curse, book.written_work.part_of_series, Percy Jackson & the Olympians
The Lightning Thief, book.book.genre, Greek mythology
Camp Half-Blood Chronicles, fictional_universe.fictional_setting.characters_that_have_lived_here, Percy Jackson
Hera, book.book_character.appears_in_book, The Lost Hero
The Battle of the Labyrinth, book.book.genre, Greek mythology
Percy Jackson, fictional_universe.fictional_character.places_lived, Camp Half-Blood Chronicles
The Battle of the Labyrinth, book.written_work.part_of_series, Percy Jackson & the Olympians
The Lost Hero, book.book.characters, Tyson the Cyclops
Percy Jackson & the Olympians, common.topic.notable_for, g.1yl5nxs2c
The Mark of Athena, book.book.genre, Fantasy
The Titan's Curse, book.written_work.next_in_series, The Battle of the Labyrinth
The Lightning Thief, common.topic.notable_types, Book
Percy Jackson, book.book_character.appears_in_book, The Son of Neptune
The Lightning Thief, book.book.characters, Annabeth Chase
The Battle of the Labyrinth, common.topic.notable_types, Book
Percy Jackson, fictional_universe.fictional_character.powers_or_abilities, Water Manipulation
The Son of Neptune, book.book.characters, Jason Grace
m.09ybxqq, common.webpage.topic, Rick Riordan
Rick Riordan, book.author.works_written, The Throne of Fire
The Son of Neptune, book.book.characters, Reyna Avila Ramírez-Arellano
The Mark of Athena, book.book.characters, Piper McLean
Author, type.type.expected_by, Author
The Sea of Monsters, media_common.adapted_work.adaptations, Percy Jackson: Sea of Monsters
The Mark of Athena, book.book.characters, Percy Jackson
The Battle of the Labyrinth, book.written_work.next_in_series, The Last Olympian
m.08nknvq, film.performance.film, Percy Jackson & the Olympians: The Lightning Thief
Tyson the Cyclops, book.book_character.appears_in_book, The Titan's Curse
The Lost Hero, book.written_work.original_language, English Language
The Battle of the Labyrinth, book.written_work.previous_in_series, The Titan's Curse
The Last Olympian, book.book.genre, Adventure fiction
Rick Riordan, book.author.works_written, Mission Road
The Lightning Thief, book.written_work.original_language, English Language
The Battle of the Labyrinth, book.book.editions, The battle of the Labyrinth
The Lost Hero, book.book.characters, Piper McLean
Fiction, media_common.media_genre.child_genres, Speculative fiction
Rick Riordan, book.author.works_written, The Black Book of Buried Secrets
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Rachel Elizabeth Dare
Rick Riordan, book.author.works_written, The House of Hades
m.0b46524, common.webpage.topic, Rick Riordan
The Mark of Athena, book.written_work.part_of_series, Camp Half-Blood Chronicles
The Demigod Files, book.written_work.author, Rick Riordan
The Son of Neptune, book.book.characters, Leo Valdez
Percy Jackson, common.topic.notable_types, Film character
The last king of Texas, book.book.editions, The last king of Texas
The Battle of the Labyrinth, book.book.editions, The Battle of the Labyrinth (Percy Jackson and the Olympians, Book 4)
Percy Jackson, fictional_universe.fictional_character.character_created_by, Rick Riordan
The last king of Texas, common.topic.notable_types, Book
The Son of Neptune, freebase.valuenotation.has_value, Date written
The Last Olympian, book.book.editions, The Last Olympian
Rick Riordan, book.author.works_written, The Battle of the Labyrinth
The Sea of Monsters, book.book.genre, Speculative fiction
The Son of Neptune, common.topic.notable_for, g.1258c4ydw
The Battle of the Labyrinth, book.book.genre, Children's literature
The Battle of the Labyrinth, book.written_work.part_of_series, Camp Half-Blood Chronicles
The Lightning Thief, book.written_work.subjects, Adventure
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, g.122sg15v
Tyson the Cyclops, book.book_character.appears_in_book, The Battle of the Labyrinth
The Last Olympian, common.topic.article, m.04y5m9v
Rick Riordan, book.author.book_editions_published, Big Red Tequila
The Last Olympian, common.topic.notable_for, g.12585pjl5
Percy Jackson & the Olympians: The Lightning Thief, film.film.sequel, Percy Jackson: Sea of Monsters
The Lightning Thief, book.book.characters, Percy Jackson
The Titan's Curse, freebase.valuenotation.has_value, Date written
The Titan's Curse, book.written_work.author, Rick Riordan
The Battle of the Labyrinth, book.book.genre, Adventure fiction
The Mark of Athena, book.book.characters, Hazel Levesque
The Lost Hero, common.topic.article, m.0bwm2lv
The Lightning Thief, book.book.characters, Silena Beauregard
Rick Riordan, book.author.works_written, The Widower's Two-Step
Rick Riordan, book.author.works_written, The Lightning Thief
Rick Riordan, book.author.works_written, Percy Jackson and the Olympians 5-book Boxed Set
The Lost Hero, book.book.characters, Festus \"Happy the Dragon\"
The Lost Hero, book.book.characters, Gaia
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Thalia Grace
The Mark of Athena, book.written_work.previous_in_series, The Son of Neptune
The Lost Hero, book.written_work.next_in_series, The Son of Neptune
Percy Jackson, symbols.namesake.named_after, Perseus
Mission Road, book.book.editions, Mission Road
The Lost Hero, common.topic.notable_for, g.1257l41h8
m.011dw_ym, theater.theater_role.role, Percy Jackson
Young-adult fiction, media_common.media_genre.parent_genre, Fiction
The Son of Neptune, book.book.characters, Percy Jackson
m.0d31rqm, film.performance.film, Percy Jackson: Sea of Monsters
m.0b479gb, common.webpage.topic, Rick Riordan
Author, people.profession.specialization_of, Writer
Rick Riordan, book.author.works_written, The Son of Neptune
Rick Riordan, book.author.works_edited, Demigods and Monsters
Rick Riordan, book.author.book_editions_published, Rebel Island
The Lost Hero, book.book.characters, Nico di Angelo
The Battle of the Labyrinth, book.book.characters, Tyson the Cyclops
The Last Olympian, book.written_work.part_of_series, Percy Jackson & the Olympians
The Son of Neptune, book.book.characters, Piper McLean
Percy Jackson, fictional_universe.fictional_character.gender, Male
The Son of Neptune, book.book.editions, The Son of Neptune
Play, freebase.type_hints.included_types, Topic
The Demigod Files, book.book.characters, Percy Jackson
The Titan's Curse, book.book.genre, Young-adult fiction
Play, type.type.properties, Productions
The Titan's Curse, book.book.genre, Greek mythology
The Lost Hero, book.book.editions, The Lost Hero
The Lightning Thief, book.book.editions, The Lightning Thief
The Sea of Monsters, book.written_work.next_in_series, The Titan's Curse
The Lightning Thief, theater.play.characters, Percy Jackson
Percy Jackson, fictional_universe.fictional_character.powers_or_abilities, Healing factor
The Lightning Thief, book.book.characters, g.122sg15v
Rick Riordan, book.author.works_written, The Staff of Serapis
The Sea of Monsters, book.book.characters, g.122sg15v
The Sea of Monsters, book.book.genre, Greek mythology
Percy Jackson, fictional_universe.fictional_character.siblings, m.0h_41x4
The Son of Neptune, book.book.characters, Frank Zhang
Sally Jackson, fictional_universe.fictional_character.children, Percy Jackson
Annabeth Chase, book.book_character.appears_in_book, The Mark of Athena
m.0646ff6, film.performance.film, Percy Jackson & the Olympians: The Lightning Thief
Tyson the Cyclops, book.book_character.appears_in_book, The Lost Hero
The Last Olympian, common.topic.notable_types, Book
The Mark of Athena, book.book.characters, Annabeth Chase
The Lost Hero, book.book.characters, Gleeson Hedge
Rick Riordan, book.author.works_written, The Lost Hero
Demigod, common.topic.article, m.01p4j4
The Lightning Thief, freebase.valuenotation.is_reviewed, Playwright
Writer, people.profession.corresponding_type, Author
Rick Riordan, book.author.book_editions_published, The battle of the Labyrinth
Percy Jackson, fictional_universe.fictional_character.parents, Sally Jackson
Eric Meyers, freebase.valuenotation.is_reviewed, Gender
Male, common.topic.notable_for, g.1255p_jgc
Rick Riordan, book.author.works_written, Rebel Island
Rick Riordan, book.author.works_written, Percy Jackson's Greek Gods
m.095t6f8, award.award_nomination.nominated_for, The Widower's Two-Step
Percy Jackson, book.book_character.appears_in_book, The Lost Hero
The Lightning Thief, common.topic.notable_for, g.11b60sthjp
The Demigod Files, book.book.genre, Greek mythology
The Lightning Thief, freebase.valuenotation.is_reviewed, Genre
The Lost Hero, freebase.valuenotation.has_value, Date written
The Battle of the Labyrinth, book.book.editions, The Battle of the Labyrinth
Book, freebase.type_profile.strict_included_types, Topic
m.0h_41x4, fictional_universe.sibling_relationship_of_fictional_characters.siblings, Percy Jackson
Camp Half-Blood Chronicles, common.topic.notable_types, Fictional Setting
The Devil Went Down to Austin, book.written_work.author, Rick Riordan
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Chiron
Author, freebase.type_profile.published, Published
Percy Jackson & the Olympians: The Lightning Thief, film.film.story_by, Rick Riordan
The Lightning Thief, book.book.genre, Young-adult fiction
Rick Riordan, book.author.works_written, The Maze of Bones
The Demigod Files, book.written_work.part_of_series, Camp Half-Blood Chronicles
m.0gtkl4p, fictional_universe.romantic_involvement.partner, Percy Jackson
Rick Riordan, book.author.works_written, The Devil Went Down to Austin
The Lost Hero, book.book.characters, Hazel Levesque
The Lost Hero, book.written_work.part_of_series, The Heroes of Olympus
Percy Jackson, fictional_universe.fictional_character.romantically_involved_with, m.0gtkl4p
The Son of Neptune, book.book.characters, Annabeth Chase
The Sea of Monsters, book.book.characters, Chiron
The Lightning Thief, book.book.characters, Clarisse
The Mark of Athena, book.book.genre, Young-adult fiction
The Last Olympian, book.book.characters, Tyson the Cyclops
Male, common.topic.article, m.05zpq8
The Titan's Curse, book.book.characters, Tyson the Cyclops
Mission Road, book.book.genre, Speculative fiction
The Sea of Monsters, book.written_work.subjects, Classics
The Sea of Monsters, book.written_work.subjects, Friendship
The Lost Hero, book.book.characters, Annabeth Chase
The Sea of Monsters, book.book.genre, Fantasy
Rick Riordan, book.author.works_written, The Titan's Curse
Poseidon, fictional_universe.fictional_character.children, Percy Jackson
The Lightning Thief, book.book.editions, The Lightning Thief: Percy Jackson and the Olympians
Mission Road, book.written_work.author, Rick Riordan
The Lightning Thief, freebase.valuenotation.is_reviewed, Productions
The Last Olympian, book.book.genre, Young-adult fiction
Rick Riordan, book.author.book_editions_published, The Devil Went Down to Austin
Annabeth Chase, book.book_character.appears_in_book, The Lightning Thief
The Sea of Monsters, book.written_work.author, Rick Riordan
The Lost Hero, book.written_work.author, Rick Riordan
Rick Riordan, book.author.works_written, The Last Olympian
Rick Riordan, book.author.book_editions_published, The last king of Texas
The Sea of Monsters, book.book.genre, Children's literature
The Lost Hero, book.book.characters, g.122sg15v
The Son of Neptune, book.book.characters, Amazons
Rick Riordan, book.author.works_written, The Red Pyramid
m.0g4m8n_, award.award_honor.honored_for, The Widower's Two-Step
The Lost Hero, book.written_work.previous_in_series, The Last Olympian
m.0g4m99n, award.award_nomination.nominated_for, The Widower's Two-Step
The Lost Hero, book.book.genre, Young-adult fiction
The Mark of Athena, book.book.characters, Jason Grace
Percy Jackson, book.book_character.appears_in_book, The Battle of the Labyrinth
The Sea of Monsters, book.book.characters, Percy Jackson
The Lightning Thief, book.book.genre, Children's literature
The Titan's Curse, book.written_work.part_of_series, Camp Half-Blood Chronicles
The last king of Texas, book.written_work.part_of_series, Tres Navarre (non-genre mystery series)
The Sea of Monsters, book.book.genre, Fiction
The Mark of Athena, book.book.characters, Leo Valdez
The Lightning Thief, book.book.genre, Fantasy
The Lightning Thief, common.topic.article, m.0fqnrg
Rick Riordan, book.author.works_written, The last king of Texas
Percy Jackson & the Olympians: The Lightning Thief, film.film.subjects, Greek mythology
The Son of Neptune, book.book.characters, Ella
The Lightning Thief, book.written_work.part_of_series, Camp Half-Blood Chronicles
Rick Riordan, fictional_universe.fictional_character_creator.fictional_characters_created, Percy Jackson
The Son of Neptune, book.book.genre, Fantasy
Mission Road, book.written_work.part_of_series, Tres Navarre (non-genre mystery series)
Annabeth Chase, book.book_character.appears_in_book, The Lost Hero
The Titan's Curse, book.written_work.original_language, English Language
Percy Jackson & the Olympians, fictional_universe.fictional_universe.characters, Clarisse
Percy Jackson & the Olympians, common.topic.notable_types, Fictional Universe
Tyson the Cyclops, book.book_character.appears_in_book, The Last Olympian
Percy Jackson & the Olympians: The Lightning Thief, media_common.adaptation.adapted_from, The Lightning Thief
The Last Olympian, book.written_work.next_in_series, The Lost Hero

Answer: The Sea of Monsters