The House of Hades by Rick Riordan is the fourth installment in the Heroes of Olympus series. It follows seven Greek and Roman demigods—Percy Jackson, Annabeth Chase, Hazel Levesque, Frank Zhang, Leo Valdez, Jason Grace, and Piper McLean—on a high-stakes mission to thwart the earth goddess Gaea’s rise, which threatens to destroy the world. The story alternates between the group's efforts aboard the Argo II and Percy and Annabeth's harrowing journey through Tartarus. While Percy and Annabeth battle monsters and rely on unexpected allies like Bob the Titan to survive the underworld, the rest of the crew races across Europe to reach the Doors of Death. Along the way, they confront magical challenges, personal revelations, and formidable enemies, including sorceress Pasiphaë and the giant Clytius. Through teamwork and courage, the demigods manage to close the Doors of Death, setting the stage for a climactic showdown in Athens to prevent Gaea’s awakening. Told with humor, heart, and mythological adventure, this installment deepens the characters' bonds and raises the stakes for the series finale.
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