After Marco's betrayal, Jack McKinley and his friends must face their own demons and engage in a battle with foes long gone.

Percy Jackson meets Indiana Jones in the final installment of the New York Times bestselling epic adventure Seven Wonders! Jack, Marco, Cass, and Aly's quest to find the seven magic orbs buried beneath each of the Seven Wonders of the Ancient World has hit a perilous snag. King Uhla'ar has kidnapped Aly and taken her and an orb back through a rift in time. A giant, merciless behemoth guards the opening, and so Jack and his friends realize that their...