Percy Jackson wakes up in the Roman camp with no memory. This is the year that Percy lost thanks to Hera. Gia is making her plans and going to attack Camp Jupiter. Percy, Frank, and Hazel take off on a quest to find the book of prophecies. They need to stop Gia waiting and taking over the world. The two camps are going to have to find a way to work together in order to move forward on this new adventure.