The Lightning Thief (Percy Jackson and the Olympians, #1)

Percy Jackson is a good kid, but he cant 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. Percys mom decides its time that he knew the truth about where he came from. She sends Percy to Camp Half-Blood, a summer camp for demigods (on Long Island), where he learns that the father he never knew is Poseidon, God of the Sea. Soon a mystery unfolds and together with his friends, one a satyr and the other the demigod daughter of Athena, Percy sets out on a quest across the United States to reach the gates of the Underworld (located in a recording studio in Hollywood) and prevent a catastrophic war between the gods. But to succeed on his quest, Percy will have to unravel a treachery more powerful than the gods themselves