Percy can't believe it: His missing father is the sea god Poseidon. Finally, Percy understands why he is constantly being pursued by terrifying monsters from Greek mythology. Fortunately, he finds loyal friends at Camp Half-Blood: Annabeth, the daughter of Athena; Grover, the satyr; and Tyson, the cyclops. They accompany him on his adventures in the battle for Olympus - spanning five incredibly exciting volumes. Rick Riordan's legendary megasellers in a five-pack.