Heat lightning
(Book)

"...It's a hot, humid summer night in Minnesota, and Flowers is in bed with one of his ex-wives (the second one, if you're keeping count) when the phone rings. It's Lucas Davenport. There's a body in Stillwater, two shots to the head, found near a veteran's memorial. And the victim has a lemon in his mouth. Exactly like the body they found last week. 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 only he could find out what connects them all...and then he does, and he's almost sorry he did. Because if it's true, then this whole thing leads down a lot more trails than he thought it did--and every one of them is booby-trapped."