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The House of Hades is the fourth book in Rick Riordan's Heroes of Olympus series, following the "Prophecy of Seven" as the demigods race to stop the Earth Mother Gaea from rising. The plot centers on Percy Jackson and Annabeth Chase falling into the Underworld, while the other five demigods (Leo, Piper, Jason, Hazel, and Frank) must find the mortal side of the Doors of Death to seal them from both ends, preventing monsters from being reborn and Gaea's armies from becoming immortal. The story alternates perspectives between the seven demigods as they face challenges in both the mortal world and the depths of Tartarus.