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Hilda's world is upset as she faces the prospect of leaving her snow-capped birthplace for the city when her mother, an architect, is offered a job.

"Under the Titan Hyperion's rule, the sun is burning even brighter than normal, and scorching everything in northern Greece--including the villagers! The Olympians are forced to play an un-fun game of Dodge the Sunbursts as Hyperion hurls giant fireballs that could fry them up! What's worse, it looks like a familiar foe, Cronus, is hot on Zeus, Poseidon, and Hades's trail.

"Annabeth and Percy tumble into a pit leading straight to the Underworld.

Uniting with Jason, Piper, and Leo after their dangerous quest, Percy, Hazel, and Frank wonder who will be chosen to fulfill the Prophecy of Seven, completing their group's number, and sail with them to an ancient land to find the mysterious Doors of Death.