After the Second Giant War, Percy was finally able to relax. However, when a son of Morpheus enters camp, the campers soon turn on Percy and drive him out of camp. Looking for a new life while coming to terms with his friend's betrayal, he reads about the many worlds outside of Earth and his decision was instantly made. Mainly focuses on his adventures and time in Chaos army

Jason, Thalia, and Percy Grace are all children of Julia Grace, lover of Zeus/Jupiter. The twins, Jason and Percy, have to be separated from Thalia due to their Roman heritage. When the boys arrive at Camp Jupiter, they don't know that in a couple years' time, they will both be thrust into two wars.