Now it's up to Percy and his friends: Their arch-enemy Kronos is preparing for the final strike and is marching towards Olympus, right into the heart of New York - meanwhile, the Olympic gods have all left to fight against the resurrected monster Typhon! Together with the Hunters of Artemis and the reawakened monuments of the city, the young demigods are trying to defend the seat of the gods, but unfortunately, they also have a spy in their midst. At least one goddess has remained on Olympus...