I Know Their Crimes. Star prosecutor Kristen Mayhew has a harmful key admirer. He appears to know her every thought, her every move. He sends her letters. And he kills the scammers she herself is usually powerless to stop. I LOOK FOR the Guilty. This avenger actually knows Kristen’s deepest secret-the one that has held her from surrendering her heart to Abe Reagan, the authorities detective sworn to protect her. Like Kristen, Reagan is normally haunted by the loss of something precious that may never end up being regained. But in the darkness of a calculating serial killer, both turn to each other and dare to rediscover enthusiasm…even as the messages and vicious murders continue. Even while the killer’s thirst for retribution makes Kristen a target for murder.