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 Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors from both sides and prevent the giants from raising Gaea. But, Leo wonders, if the Doors are sealed, how will Percy and Annabeth be able to escape?
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