Percy no longer understands the world. Every year he flies from a different school. Strange accidents happen to him all the time. And now they're blaming him for the tornado! Slowly he realizes that someone is out to get him.
When Percy, with the help of his friend Grover, saves himself from a Minotaur in Camp Half-Blood, he learns the truth: His father is the sea god Poseidon, so Percy is a demigod. And he has a powerful enemy: Kronos the Titan.
The gods are upside down - and Percy and his friends face an incredible adventure ...