The Demigod Files is a companion book to the Percy Jackson & the Olympians series. It includes three short stories that take place between The Battle of the Labyrinth and The Last Olympian, plus extra Camp Half-Blood information.
Percy helps Clarisse recover Ares’ stolen war chariot, which was taken by the gods of fear, Phobos and Deimos. He later joins a dangerous mission during a Capture the Flag game involving a bronze mechanical dragon and deadly monsters. In the final story, Percy travels to the Underworld with Thalia and Nico to retrieve a stolen sword belonging to Hades, where they face the Titan Iapetus.
The book also includes interviews with campers, monster profiles, and background details about Camp Half-Blood and Greek mythology.