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 worsePercy 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 friendsone a satyr and the other the demigod daughter of AthenaPercy 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.