One half of a murder-mystery writing team kills his more talented partner after the latter announces his intentions to go solo which would ultimately leave the former in financial ruin. Later a grocery store owner, who has important information pertaining to the case and has romantic desires for the killer, sees this incident as an opportunity to blackmail him into having a relationship with her. Feeling cornered, he kills her and tries to make it look like she'd fallen off a boat and drowned in a drunken stupor.

A private detective kills the wife of one of his most important clients when she refuses to take part in his blackmail scheme and even plans to expose his unsavoury methods to her husband. In an ironic twist, the PA is rehired by his client to assist Columbo in the investigation.

While on a sailing-boat, Helen Stewart witnesses far-away, inside a room, a man with a gun killing another. She notifies the fact to the Police and Lt. Columbo begins to investigate. The man is the famous General Martin Hollister, a war hero. Lt. Columbo searches his house and afterwards he is very doubtful about Helen's statement. Written by Baldinotto da Pistoia

Lt. Columbo investigates the murder of Rudy Matthews, an art collector found shot to death in his home. The killer is the dead man's nephew, art critic Dale Kingston, who, with the help of his accomplice Tracy O'Connor, effectively masks the time of death to give himself an alibi at an art exhibit. From the outset, Columbo can't quite understand why the thief would have first selected a painting of lesser value before suddenly switching to the two most valuable paintings after the killing. Kingston tries to point Columbo in the direction of his aunt, Matthews' ex-wife Edna. The fact that Matthews left his entire art collection to her seems to support that idea. Columbo isn't buying it and sets a clever trap for him. Written by garykmcd / corrected by statmanjeff

Beth Chadwick has lived all her life controlled first by her father, then after his death, by her brother Bryce who manages the family business. Now she has fallen for Peter Hamilton, who works for Bryce. But, as usual, Bryce objects to her choice and threatens to fire Peter. So Beth decides to murder her brother and to do it in such a way to let it to appear like an accident. Lt. Columbo realizes at once the truth and starts looking for evidence. Written by Baldinotto da Pistoia

A chemist decides to kill his uncle in order to prevent him selling the family business to a conglomerate in exchange for a seat on the Board of Directors, by concealing a time-delaying explosive device inside a box of his uncle's favourite cuban cigars.

Millionaire Bo Williamson returns from two months in Europe and finds an unpleasant surprise: his second wife, Jennifer, has financed a new town construction project. Incensed, Bo confronts Elliot Markham, the architect with the original idea. Shortly thereafter, Bo disappears again, and it looks as if he's off on another European trip, but his first wife, Goldie, doesn't think so and - despite the lack of a body - gets Lt. Columbo to look into it for her. It doesn't take the detective long to sense something is indeed amiss, but where's the corpse? Written by Baldinotto da Pistoia