In her fourth F.B.I. K-9 Novel, Sara Driscoll weaves fast-paced suspense and the fascinating world of law enforcement canines, as Special Agent Meg Jennings and her search-and-rescue dog, Hawk, are on the trail of a killer hiding where others fear to tread...

For Meg Jennings and her K-9 companion, Hawk, exploring a deserted building is an exciting way to sharpen their skills without the life-or-death stakes they face as part of the F.B.I.'s Human Scent Evidence Team. But deep in an abandoned asylum, Hawk finds the body of an elderly woman. Soon, Meg learns of more elders found dead in neglected urban structures.

Meg is sure a murderer is on the hunt, and she can prove it if she can just find a connection. It will take the expert coordination of her whole team, along with help from Clay McCord and Todd Webb, to uncover the means, let alone a motive. And to stop someone who has operated in the dark for so long, Meg will need to risk more than she has to give...