Cougar Claw by Cary J. Griffith

A cougar sighting in the Minnesota River Valley is incredibly rare. A deadly cougar attack on a human in this area is about as likely as getting struck by lightning- twice. Yet when wealthy business owner Jack McGregor is found dead, the physical evidence seems incontrovertible.

The sheriff brings in Sam Rivers, a special agent with the U.S. Fish & Wildlife Service and a wildlife biologist, to examine the scene and sign off on his conclusions. But Sam has a penchant for understanding predators, and he uncovers details that challenge law enforcement's open-and-shut-case.

To find justice, Sam must take matters into his own hands, enlisting the help of his wold dog, Gray, who's in training to become a working dog for the USFW. Gray's nose leads the investigation in unexpected directions, and the more rocks Sam turns over, the more motives slither out.