A connoisseur running a California winery murders his younger half-brother to prevent him from selling the family business. 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. Columbo hits the campaign trail to catch the killer.
The director of a government institute that employs various scientific geniuses commits a clever murder. But another kind of genius is on the case: Lt. Columbo.