It is Percy Jackson's 3rd year at Camp Half-Blood. When he receives a call from his best friend Grover, He and his friends Thalia and Annabeth go to find out what the problem is only to find 2 more mysteries Half-Bloods who don't know who their parents are. Then comes a bigger problem, Annabeth and one Olympian called Artemis have been captured by Percy' number one enemy, Luke. So if Artemis is missing from the Winter solstice they will lose another year of war preparations. So Percy must combine forces with the Hunters, meet strange new allies and save Annabeth and Artemis from world domination.