One member of a mystery-writing-team decides to kill his more talented partner when the better writer decides to go solo.

The mistress of a conductor becomes a target for murder after threatening to tell all to her lover's wife.

En fitness-fanatiker falder død om, og Columbo tror ikke på naturlige årsager. Har den berømte tv-kok blandet gift i sovsen? Eller er det hans tvillingebror? Hvem er hvem, og hvem var hvor hvornår?

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.

While investigating the death of a popular actor, Columbo must outwit a cunning dentist, who has set up his wife for a murder in order to keep up his image and expensive lifestyle.