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Henry Houghton (Bernard Lee) is a navy clerk who loathes his work and feels that his life lacks luster. So when a secret agent (William Sylvester) asks him to steal military secrets in exchange for a hefty fee, Houghton agrees. Before long, the newly minted spy is seducing a high-ranking secretary (Margaret Tyzack) to solicit classified files. This thrill-seeking couple relish their ill-gotten gains until the British government begins to close in. Wikipedia