Percy Jackson's life changed forever when he discovered that he is not just an ordinary kid, but a demigod, the son of Poseidon and a mortal.

At Camp Half-Blood, he found others like him, and with his friends Annabeth and Grover, he managed, after a great adventure, to uncover who had stolen Zeus's lightning bolt.

However, the adventure in the world of gods and heroes never really ends...

[Excerpt from the text on the back cover of the edition]