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The House of Hades (Heroes of Olympus, The, Book Four: The House of Hades)… (edition 2015)
by Rick Riordan (Author)
The House of Hades by Rick Riordan
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"Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process"--
(summary from another edition)
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