Ellen Benson, recently separated from her husband Carey, is ready to leave her stylish apartment for a dinner-date with friends. She suddenly feels extremely ill and manages to get a message to her doctor who gets her to a hospital in time to save her life. Her physician, Dr. Hover informs M Squad that because the bottles of insulin that she had were tampered with, substituting water for the life-saving medication, she had been dangerously close to entering a diabetic coma. As Lt. Ballinger investigates this obvious murder attempt, he learns that both her brother, who lives in the same building, and her estranged husband, would benefit substantially from her death.
—Harry Tumilson