A battle between the gods rips the world apart leaving nothing but smoking remains. But Hades has a plan to stop the fight. A secret weapon that he must enter Camp Half-Bloor to retrieve. Will he be able to cross the threshold or will Annabeth fight until her last breath?

The gods are dead. No sun means that fire has become the most valuable resource. When firewood runs out at Camp Half-Blood Percy and Annabeth must move their campers across the lake to Camp Crystal Lake where they run into a waterlogged camper and his frightening mother.