An ancient Incan prophecy leads the Gaunt twins deep into the heart of the Amazon, in search of a cursed portal that has remained hidden for centuries. Along the way, they come across their old friend Dybbuk, but it's not a happy reunion. Dybbuk has lost all his djinn powers and is desperate to get them back - even if it means destroying the world. Can John and Philippa stop him before it's too late?