The Man Who Fell From the Sky by Margaret Coel (2015)

One more of my out West books picked up a Wall Drug. Not bad, but seemed to take me forever to get through this. Margaret Coel is a historian who is considered an expert on Arapaho Indians of Colorado and Wyoming. Her mysteries feature Father John and Arapaho lawyer Vicky as mystery solvers. 

Robert Walking Bear's death in a lake may have been an accident, but since he was looking for Butch Cassidy's treasure, there are some doubts. This mystery is based on the true fact that Butch Cassidy did have friends in the area and that he did have a relationship with Mary Boyd, half white and half Indian, and that she did have a daughter. As far as Coel knows, no one ever did find Cassidy's treasure. I did appreciate a window into the current world of the Native Americans living in the state where my cousin resides.