The Man Who Never Was is the true story of how the Allies threw the Nazis off track in planning the invasion of Sicily. The British Royal Navy exhumes the corpse of a man who died of natural causes, arranging to make it appear as though the dead man was a special services operative carrying the secret invasion plans. The elaborate ruse includes creating a fictional identity for the "spy," then faking a drowning for the corpse and having the body wash up on shore with false information. The plan is complicated by Lucy Sherwood (Gloria Grahame), the girl friend of the dead man, and Patrick O'Reilly (Stephen Boyd), a German espionage agent. The Man Who Never Was moves too slowly to maintain excitement, but it works well on a pure storytelling level.
~ Hal Erickson, All Movie Guide