Former Governor Dick Sawyer may be dying, but he has one final mission for Bill Travis. Bill has to fly to Pist , Mexico, to find Walt Cannon, friend and retired Texas Ranger who disappeared while on the trail of a man named Sunlight-a ruthless killer, drug lord, revolutionary and cult leader. Sunlight wants to return Mexico to the rule of the ancient Maya, but between the jungle and the ruins of a civilization long dead is the most dangerous animal of all-the Mexican Army. With the help of a Mexican police captain, a little girl, and an ornery donkey, Bill Travis must go toe-to-toe with his most dangerous enemy yet in order to save a friend.