
Also known as The Heroes of Olympus book 4
2013 novel by Rick Riordan
via Open Library
The House of Hades | Rick Riordan
At the conclusion of The Mark of Athena, Annabeth and Percy tumble into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy’s instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea’s forces, and
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