A self-styled "motivation research specialist" uses subliminal cues to commit a murder. Lt. Columbo is on the case.

Senatorial candidate Nelson Hayward murders his domineering campaign manager, staging it to appear that Hayward himself was the intended victim of a mob hit gone wrong.

A wine connisseur kills his half- brother to prevent him selling the family winery to a merchant company so he can pay off his gambling debts.

The formula for a miracle wrinkle cream leads the founder of a cosmetics company to murder and Columbo is on this case.

A smarmy TV chef and his identical twin brother, a rigidly proper banker, are suspects in the electrocution of their rich uncle.

A chess player murders his opponent before a big match. Lt. Columbo must out-maneuver this crafty, but craven, killer.

A surgeon has an ingenious plan for murdering his partner in a research project, but a nurse catches onto the scheme.

A faded movie actress commits murder. Lt. Columbo, one of her biggest fans, is on the case.