A health and fitness franchiser who sells supplies to his franchisees at exorbitant prices murders one of them after they discovered his criminal business practices. Lt. Columbo has to outsmart the crafty killer to solve this one.
The commandant of a military academy for boys kills the chairman of the board for planning on turning the academy into a coed junior college. Lt. Columbo takes up residence in the barracks to investigate what looks like an accident.
Lt. Columbo and his wife win a pleasure cruise to Acapulco, but the lieutenant finds himself investigating a murder aboard the cruise ship when a married car dealer kills an ex-lover who's been blackmailing him over their past fling.
An inventor in love with gadgets murders his mother-in-law after she fires him as CEO of her electronics company, and uses his expertise of surveillance systems to craft the perfect alibi. Lt. Columbo is on the case.
During a physical altercation, a psychiatrist who specializes in hypnosis kills the husband of a patient with whom he's been having an affair and convinces the wife to lie to the police; it's up to Lt. Columbo to discover the truth.
