Question: Library of Souls is the third book in which Ransom Riggs fantasy series?

Context articles: The Sin Eater’s Daughter
Library of Souls
Miss Peregrine's Home for Peculiar Children
Ransom Riggs
Quest for the Well of Souls
The Stormlight Archive
Riggs Library
Imaginary Worlds: The Art of Fantasy
Everett Public Library
Hollow City (novel)

The Sin Eater's Daughter is a young adult fantasy series written by Melinda Salisbury and published by Scholastic Press.
 The first book in the series, "The Sin Eater’s Daughter", was published on 24 February 2015 and marked Salisbury's first book in print.
 The second book in the series, "The Sleeping Prince", was published the following year along with a short story prequel, "The King of Rats".
 The third book in the series, "The Scarecrow Queen", was released in 2017.
 A fourth book, "The Heart Collector", was also published in 2017, it is a collection of 3 short stories from the same fictional universe, including the previously released "The King of Rats", as well as 2 new stories, "The Heart Collector" and "Mully No-Hands".
Library of Souls is a sequel to 2014 novel "Hollow City" written by Ransom Riggs and third book in the series of "Miss Peregrine's Home for Peculiar Children".
 It was released on September 22, 2015 by Quirk Books.
Miss Peregrine's Home for Peculiar Children is a contemporary fantasy debut novel by American author Ransom Riggs.
 The story is told through a combination of narrative and vernacular photographs from the personal archives of collectors listed by the author.
Ransom Riggs (born February 3, 1979) is an American writer and filmmaker best known for the book "Miss Peregrine's Home for Peculiar Children".
Quest for the Well of Souls is the third book in the Well of Souls series by the American author Jack L. Chalker, and completes the Wars of the Well World duology begun with "Exiles at the Well of Souls".
 A foreword by Chalker indicates that Quest and Exiles were originally conceived as a single book, but due to the decision to split them, Quest was written to be readable as a standalone novel.
The Stormlight Archive is an ongoing epic fantasy series written by American author Brandon Sanderson.
 Planned as the first of ten books, "The Way of Kings" was published on August 31, 2010 by Tor Books in the United States.
 The second book, "Words of Radiance", was published on March 4, 2014.
 The third book in the series, titled "Oathbringer", is scheduled to be released on November 14, 2017.
Riggs Library was the main library of Georgetown University from 1891-1970, until being replaced by Lauinger Library.
 It was housed in the south tower of Healy Hall, on the third floor.
 Riggs Library is one of the few extant cast iron libraries in the nation.
 The library still serves its original function of storing books despite its primary use as a formal event space.
Imaginary Worlds: the Art of Fantasy is a study of the modern literary fantasy genre written by Lin Carter.
 It was first published in paperback by Ballantine Books in June, 1973 as the fifty-eighth volume of its "Ballantine Adult Fantasy series"; it was the only nonfiction entry in the series.
 The book was among the earliest full-length critical works devoted to fantasy writers and the history of fantasy.
 It was the third of three such studies by Carter, being preceded by "" (1969) and "" (1972).
 These works, together with his editorial guidance of the "Ballantine Adult Fantasy series", established Carter as an authority on the genre.
The Everett Public Library (EPL) serves the residents of Everett, Washington.
 EPL operates a main library at 2702 Hoyt Avenue and the Evergreen branch, at 9512 Evergreen Way.
 The main library overlooks Puget Sound and the southern end of Whidbey Island.
 The library has noteworthy artworks, including works by Dudley Pratt, Ransom Patrick, Guy Anderson, Jack Gunter, and Sonja Blomdahl.
 The library circulates over 900,000 items per year, provides exceptional book and media collections, reference services, on-line resources, in-home library services, and programs for adults, children and families.
 The library’s staff includes specialists in adult reference, children’s books, local history and career information.
 The Everett Public Library introduced a bookmobile service in May 1924; the first of its kind in Washington state, and the second in the West.
 It is also one of the few public library systems in the United States that has two full-time historians on staff, David Dilgard and Melinda Van Wingen.
 Historian Margaret Riddle retired after 31 years.
Hollow City is a 2014 dark fantasy novel and a sequel to "Miss Peregrine's Home for Peculiar Children" written by Ransom Riggs.
 It was released on January 14, 2014 by Quirk Books.
 The novel is set right after the first, and sees Jacob and his friends fleeing from Miss Peregrine's to the "peculiar capital of the world", London.