Six months of agonizing separation are finally over, but your reunion is about to spark a massive war. Annabeth is flying into Camp Jupiter aboard the Argo II, a flying magical warship with a steaming bronze dragon figurehead that looks incredibly threatening to the heavily armed Roman demigods below. She is terrified that her boyfriend, Percy Jackson, might have changed during his time with the Romans, but her bigger problem is the chilling command she carries in her pocket. A gift from her mother, the goddess of wisdom, demands that Annabeth follow the mysterious Mark of Athena and avenge her. As seven demigods from rival camps unite to sail across the ancient lands to Rome, the tension on board is explosive. You will journey across land and sea, facing down terrifying ancient monsters, decoding impossible secrets, and preparing to locate and close the deadly Doors of Death. Prepare for surprising sacrifices, unspeakable horrors, and a breathtaking adventure that forces you to trust your former enemies if you want to save the world from absolute destruction.