An old Tibetan monk has presented Paul and Sarah Manhart, the world's only husband and wife cryptozoology team, an unusual gift: a claw from a pterosaur Paul identifies to have lived during the time of the dinosaurs. The problem is that the claw is less than sixty years old, enticing them to embark on a expedition to the rooftop of the world to see whether others of its kind still roam the rarified air of Tibet. Only they hadn't bargained on getting caught up in a treacherous game of cat and mouse between the Chinese Army and winged creatures that are as vicious as they are terrifying.