Olympus is in danger! Kronos, who has gathered a vast army of Titans, wants to seize and destroy the Olympian fortress. To ensure his plan works, the ruler of the Titans performs a diversion and frees Typhon. The deceived gods go into battle against this terrible monster, leaving their home unprotected. And only Percy Jackson— the only one who saw through Kronos’s military trick—stands ready. Together with his half-blood friends, he goes to defend Olympus. Will they manage to repel the attacks of monsters, or will the defenders have to die in an unequal fight? They can only hope for a miracle—and for the help of the gods, the ones who, for now, keep neutrality in this clash.