The Lightning Thief (Percy Jackson and the Olympians Book 1)
The first book in the Percy Jackson and the Olympians series. Percy is a twelve-year-old kid who discovers he's a demigod--half human, half god-- as the absent father he's never known is actually Poseidon, king of the sea. If you're looking for books boys love, in Riordan's world, the gods stir up all kinds of trouble down on earth.
Percy Jackson is a good kid, but he can’t seem to focus on his schoolwork or control his temper. And lately, being away at boarding school is only getting worse-Percy could have sworn his pre-algebra teacher turned into a monster and tried to kill him.