Heroes of Olympus: Infinity War

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Book 2 of the Heroes of Olympus/MCU trilogy

Three years ago, Percy Jackson, Annabeth Chase, Nico Di Angelo, and Hazel Levesque were declared traitors to Olympus. They were hunted down on their way to Alaska. A final battle culminating in Sally Jackson dying. Now, Chaos has declared war on Olympus. With every intent to completely eradicate all immortal beings apart from himself. With no where else to turn to, the Olympians reach out to the four of them. They just have to hope they answer.