An old mystery writer strongly suspects her niece's husband of murdering her, so she exacts revenge by asphyxiating him in her house safe, while devising a solid alibi. Lt. Columbo is on the case.
A famous food critic, who has been extorting money from a restaurant owner in exchange for good reviews, murders him when he threatened to expose him. Lt. Columbo is on the case.
An executive secretary for a TV network kills her boss and lover after he broke up with her and passed her over for a promotion she believes she deserves. Lt. Columbo is on the case.
A behavioral psychologist whose wife died under suspicious circumstances trains his two Doberman dogs to kill her lover using the command word 'rosebud' through a telephone. Lt. Columbo is investigating.
An Irish poet and writer, who's also an undercover IRA terrorist, murders an arms dealer in Los Angeles when he deems him traitorous. Lt. Columbo is on the case.
