Gaea is on the verge of being woken up. The Seven and Nico and Thalia rush to find the solution to put her back to sleep when she recruits one of her most dangerous sons. Chiron suggests that they go to Hogwarts. Meanwhile, at Hogwarts, Voldemort is slowly rising from his death. On the way to Hogwarts, Camp Half Blood meets Harry and his companions. They realize they have to work together to defeat Gaea and Voldemort once again. Through obstacles and hardships, will they make it to the end, when both villains can be destroyed Once and for All?
6 parts