In this fourth installment of the bestselling series, the Greek and Roman demigods from the Prophesy of Seven must work together to seal the Doors of DeathNand help Percy and Annabeth escape the Underworld in the process.
The stakes are higher than ever in this adventure that dives into the depths of Tartarus..
In about a month, the Romans will march on Camp Half-Blood.
They have no time.
If the demigods don\'t succeed, Gaea\'s armies will never die.
But, Leo wonders, if the Doors are sealed, how will Percy and Annabeth be able to escape? They have no choice.
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.
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.
At the conclusion of The Mark of Athena , Annabeth and Percy tumble into a pit leading straight to the Underworld.
In this fourth installment of the bestselling series, the Greek and Roman demigods from the Prophesy of Seven must work together to seal the Doors of DeathNand help Percy and Annabeth escape the Underworld in the process
