Heroes of Olympus: son of Neptune. Rick Riordan. 2011.

Percy Jackson, son of Poseidon, God of the Sea, has woken from a very deep sleep and come face to face with two snake-haired ladies who refuse to die.

But they’re the least of his problems. Because Percy finds himself at a camp for half-bloods, which doesn’t ring any bells for him. There’s just one name he remembers from his past, Annabeth.

Only one thing is certain - Percy’s questing days aren’t over. He and fellow demigods, Frank and Hazel must face the most important quest of all: the Prophecy of Seven. If they fail, it’s not just their camp at risk, Percy’s old life, the gods and the entire world might be destroyed.........