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The House of Hades is the fourth book in the Heroes of Olympus series by Rick Riordan, which is a spin-off of his earlier Percy Jackson & the Olympians series. It continues the adventures of a group of demigods as they navigate challenges and mythological threats. The book was originally published in 2013 and is aimed at a young adult audience, blending elements of fantasy and adventure with themes of friendship and bravery.