Inspector Cockrill (Alastair Sim) of Scotland Yard begins retelling the story in voice over of the string of murders that occurred in a British Army Hospital during World War 2. It appears that a postman wounded by a German V-1 bomb has been brought into the operating theatre for surgery by Mr. Eden (Leo Genn) and Nurse Linley (Sally Gray), mysteriously dies from unknown causes during a relatively minor surgical procedure. For the anesthetist Dr. Barney Barnes (Trevor Howard) this is a repeat of a similar event he was responsible for from a few years back and he is confounded by the event. This is just the start as Nurse Bates (Judy Campbell), jealous over the attention that Eden shows to Sally, proclaims to a room full of hospital employees at a dance that the postman was murdered and further more that she knows where the clues are. As she goes to retrieve the evidence in the darkness of the operating theatre, a killer dressed in white operating scrubs appears behind her in a flash of light. After this and some other unexplainable events Inspector Cockrill comes in to investigate the case; he determines that any one of the five remaining medical professionals could be the murderer. When an attempt is made on the life of one of the nurses, Inspector Cockrill uses her as bait to draw out the real murderer by setting up an operation identical to the one in which the postman died, causing the murderer to appear.
Question: Who reveals that the death of Higgins was not an accident?, Answer: <No Answer> Question: Who does Barnes compete with over the affections of Nurse Freddi?, Answer: <No Answer> Question: Where is the film set?, Answer: A British Army hospital during World War II Question: What year does the movie take place?, Answer: <No Answer>