Percy Jackson, Thalia Grace, and Annabeth Chase meet Grover at Westover Hall. He has found two new demigods. Meeting the demigods, Bianca and Nico draw Percy and his companions into a deadly battle. They are rescued by the Hunters. Their leader the goddess, Artemis, sends her Hunters and Percy’s companions to Camp Half-Blood, while she goes in search of a monster. Percy is drawn into a quest with Zoe, the lieutenant of the Hunters, Thalia, Bianca, and Grover when the goddess disappears.