Question: Pittacus Lore authored books in the young adult science fiction series "The Lorien Legacies", including The Power of Six and what prequel?
Sentence (from "I Am Number Four"): I Am Number Four is a young adult science fiction novel by Pittacus Lore (the pseudonym of James Frey and Jobie Hughes) and the first book in the "Lorien Legacies" series.
Relevant evidence: Yes