An apparent suicide is actually the handiwork of a retired Scotland Yard investigator who is teaching a course that Mrs. Columbo is taking.

Two women own a catering firm. Both love the same man. To one, the solution is obvious: murder.

Kate has divorced her famous husband, changed her last name back to maiden Callahan, and moved to San Fernando with their girl to work for a new paper. Her first investigation involves a suspect who claims he didn't murder his wife.