Having locked the Raven's gate, fourteen-year-old Matt travels to Peru where he meets the second of the five gatekeepers and works with him to try to stop the opening of a second gate somehow related to the Nazca Lines.

"While on an expedition to Peru, archaeologist Dr. Henry Conklin makes several startling discoveries. High amid the snowcapped Andes a mysterious mummy is found hidden in a cave. And deep in the sweltering jungle below, the remains of an ancient Incan city are unearthed. Nestled between two soaring peaks, this mysterious ancient territory called the Cloud Ruins has remained undisturbed for centuries, protected by ingenious traps that only the most...