Percy Jackson and the Olympians Book #1: The Lightning Thief
by Rick Riordan
Percy discovers that he is a half-blood; his mother is human, but the father he has never known is Poseidon, God of the Seas! As a demi-god, Percy is in a lot of danger, because his father has some powerful enemies who want Percy killed. See also the other books in the Percy Jackson series, and the Heroes of Olympus series.
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