Under Desert Sand (Zack Tolliver, FBI Book 5)

Faced with a suspicious murder/suicide in the Mojave Desert, Zack Tolliver, FBI and Eagle Feather must determine what crime was actually committed and solve it under increasing threat from persons unknown. They need clues, but the desert sand leaves no trace.
This fifth novel of the Zack Tolliver, FBI series, contains all the elements of an suspenseful crime mystery: lost treasure, romance, a western gunfight, a perplexing mystery, and of course murder, cloaked ancient Indian myths.