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 like the news anchor had a heart attack while driving. But it wasn't a heart attack ... the man was poisoned by digitalis, which caused his heart to race out of control and conk out. Who gave him the digitalis, why ... and how?
—Peter Harris