The Man Who Never Was (1956)

British Intelligence during World War II is trying to get the German High Command to shift it's forces away from Italy prior to the invasion. To create the illusion of a plan for England to invade Greece a dead body is to be procured, allowed to be found with secret papers on him by Spanish authorities who will send the papers on to the Germans, or that's the plan. First they have to find a body that will look drowned, and create an identity for him that will pass the examination of the German agent who is sure to check him out. Based on a true story.