As British Dr. Bob McLaurin prepares for a dangerous surgical procedure on South American leader Juan Menda in Montreal, the doctor's wife reveals her plan to blackmail McLaurin if he refuses her demand to take a job in England. Hating the provincial life in Canada, she is willing to destroy the career of her husband and his beautiful colleague Dr. Nancy Ferguson if that's what it takes to get back home. Meantime, a trio of assassins stalks the hospital with deadly plans for the high-profile patient.