They called Brice Corrigan "Mule man" because of the animal he rode and for his disposition. A crew of ten, led by an anthropologist, was going to Arizona's Chaco Canyon to dig for relics of the Anasazi. But before they started digging, they started dying.

"Not far from Tombstone, Arizona, Burt Alvord agrees to help Bella Norton save her ranch, but can't pass up the opportunity to organize a train robbery"--

Captain Murphey was reluctant to let Jimmie Trammell join up with the Rangers. But Jim wouldn't give up. After five days, he was still waiting for Cap to give him a chance when Carolina Krole arrived with an appeal for help. Her father had died in what she considered a suspicious mine accident and she had inherited the mine which her uncle was helping her manage. Now her uncle has disappeared and she fears there may have been foul play. Captain Murphey...