 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?