To fend off a nagging Assistant District Attorney, Mac invites her to his weekly poker game. Among the other participants is Mac's dentist, who consoles Mac for biting himself while his mouth was numb from recent work on a tooth. When the dentist leaves the poker game and goes home, he finds a local TV-news anchor dead on his couch, apparently from a heart attack. The dentist's wife (who was the TV news anchor's lover) and her father (the dentist's boss) are frantic, so the dentist loads the dead man into his own car and drives it to a culvert, crashing it so it looks...