U. Perego

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?

Follow this family of six on their passage - extraordinary, hilarious and heartbreakingly poignant-from Bright Lights (of New York City) to the Northern Lights (of Norway) to the City of Light (Paris) to the speed-of-light of the Autobahn (in Munich). Continue deep into the tropics of Southeast Asia (Singapore) and end your voyage in the heights of the Swiss Alps (Geneva).