Trama

A surgeon has an ingenious plan for murdering his partner in a research project, but a paranoid nurse quickly catches onto his scheme, so he kills her. Lt. Columbo has a tough time figuring this one out.

A respected cardiologist plots to kill a colleague on the operating table by stitching up one of his heart valves with dissolving sutures after the pair disagree over the publication of new research. Later on, during the surgery, he learns one of his nurses has come across the sutures he plans to use. Fearing that she will expose him to the California State Medical Board, he kills her.