Book 3 continues the adventures of Percy Jackson. Attempting to rescue two new demigods from a monster, Percy, Annabeth and Thalia encounter The Hunters of Artemis escorting the Goddess. With Annabeth`s disappearance, Artemis begins a new hunt for an ancient monster while the hunters are sent to Camp Half blood.
There, The Oracle speaks a new prophecy, and five demigods leave to search for Artemis. Action follows action and leads to the location of both Annabeth and Artemis but there are further twists to be resolved.