The House of Hades, the fourth novel by Rick Riordan in the Heroes of Olympus series, was released on October 8, 2013.At the conclusion of the previous book in the series, The Mark of Athena, Annabeth Chase and Percy Jackson fell into a pit leading to Tartarus.
The protagonists are on a quest to close the Doors of Death, rescue Annabeth and Percy from Tartarus, and stop the Roman demigods from Camp Jupiter from attacking Camp Half-Blood.
The third-person narrators of this book are Percy Jackson, Annabeth Chase, Hazel Levesque, Leo Valdez, Frank Zhang, Jason Grace, and Piper McLean.
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