Black at Heart — Leslie Parrish

A group of elite FBI special agents has been brought together to form the Cyber Action Team, aka CAT -- and they have one mission: to solve Internet-related murders.

Even as he devotes himself to catching the Internet's most despicable criminals, Wyatt Blackstone has become a master of detaching himself from his work. But now, after the loss of a vulnerable young agent for whom he cared deeply, Wyatt's renowned icy control is starting to crack. For not only has someone started picking off evildoers, one brutal murder after another, but the clues to the crimes point to an absolutely impossible suspect: the very woman he thought he'd lost.