The Pot Thief Who Studied Billy the Kid (The Pot Thief Mysteries)

Trapped in a cave dwelling, Hubie stumbles upon a not-so-ancient mystery
Although his work is technically illegal, Hubie Schuze has no qualms with digging up ancient Native American artifacts. The government calls him a thief, but Hubie thinks of himself as a treasure hunter—and his latest quest could be his last. After lowering himself into a cave in search of Anasazi pottery, Hubie uncovers a long-dead corpse, buried where the Anasazi would never have left a body. As he puzzles over this discovery, he hears a chilling sound: his truck, left behind on the cliff face, being driven away. Stranded in the cave, the pot thief has only a corpse to keep him company.

After a narrow escape, Hubie returns with his best friend, Susannah, to try to identify the dead man. What they find instead is a mystery that takes them back not to the days before Columbus, but to the Wild West of Billy the Kid.