The Lost Hero

The Lost Hero is a 2010 American children's fantasy action-adventure middle grade children's fiction novel based on Greco-Roman classical mythology written by American author Rick Riordan. It was published on October 12, 2010, and is the first book in The Heroes of Olympus series, a sequel to the Percy Jackson & the Olympians series. It is preceded by The Last Olympian of Percy Jackson & the Olympians and followed by The Son of Neptune. The novel has since been translated into many languages and released as a hardcover, e-book, audiobook, and paperback.