Columbo

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.

Viveca Scott, the founder of Beauty Mark Cosmetics, is being threatened by her rival David Lang. When he finds out that her revolutionary cream formula actually removes wrinkles, he has the formula pirated.

A health club owner kills his partner who is about to uncover a fraud and makes it look like an accident

A fading actress kills her husband when he refuses to back her comeback show.

Ward Fowler, who plays debonair television detective Lieutenant Lucerne, has a reputation for being a difficult actor. His series is a hit, however, so the network and studio executives again and again capitulate to his demands. Although separated, husband and wife team Sid and Claire Daley continue to produce the Inspector Lucerne program. Claire continually advises everyone else to go along with their stars demands. Not even Sid knows that Claire is blackmailing Ward. Claire discovers Ward in Canada. She knows he deserted from the United States Army during the Korean War. If that information got out ,it would ruin Ward's career. When Claire takes a phone call in Ward's trailer, the actor overhears her saying she’ll be getting a sandwich at Tony’s Deli. Ward gets to Tony’s Deli just after Claire disguising himself with a ski mask and bulky parka he pretends to be a hold up man.

A writer of murder mysteries wreaks revenge on her nephew-in-law by blaming him for her niece's murder.

Lt. Columbo delves into the world of magic, ESP and slight of hand as he investigates the death of a magician, and there appears to be a tie to a prodigal psychic supported by a government founded institute on parapsychology.

A famous artist, Max Barsini, lives with his wife Vanessa and a beautiful live-in model named Julie at his beach house/studio. Max's ex-wife Louise lives in the beach house next door. Together, these women comprise Max's own little harem. He loves them all in different ways, but, more importantly, likes to control them. In fact, Max derives a great deal of satisfaction from the fact that they all fight for his attention and are reliant upon him financially and emotionally. The competitive jealousy between the women reaches a head at the dinner table one night when Max asks each of them what they think of the other. Their answers prove the intense rivalry between the women.

Lt. Columbo is invited as guest speaker in a Criminology course and squares off against two cunning students, who are confident they have duped the lieutenant with various leads, when their professor is found murdered.