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Jack Hawkins plays a former British army officer who is surprised in his home one evening by a burglar. His surprise is compounded when the intruder turns out to be one of the men from his World War II army unit. With the straight-arrow diligence of a wartime commander, Hawkins delves into the unfortunate burglar's past, trying to discover why so promising a soldier hit the skids. The film is not so much a mystery but a genteel expose of the socioeconomic problems facing discharged servicemen in postwar England. The Intruder was adapted by Robin Maugham (son of Somerset Maugham) from his own novel Line on Ginger.