On a hot, humid summer night in Minnesota, Flowers is in bed with one of his ex-wives when the phone rings. It's Lucas Davenport. There's a body near a veteran's memorial in Stillwater with two shots to the head. The victim has a lemon in his mouth - exactly like the body they found a week ago.

The more Flowers works the murders, the more convinced he is that someone's keeping a list, and that the list could have a lot more names on it. If he could only figure out what connects them. But when he does connect the dots, he almost wishes he hadn't. If his suspicion is correct, there will be a lot more trails - every one of them booby-trapped.