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. Forced to not only fend off creatures capable of killing with a single snap of their jaws but also the efforts of opportunistic Chinese Army officers intent on seeing them dead in an effort to cover up their own nefarious deeds. Fortunately, they find an unlikely ally in the guise of a surly and ruthless colonel named Deng, the only man capable of providing them their only chance at survival-if they aren't already too late.
