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Description: Alec Clunes plays a research scientist who is working overnight on guns and ammunition captured from a shot-down plane. One of the workers at the plant alerts the fifth column by saying another worker is being kept late to unload a lorry; this second worker, when coming off shift, talks in a pub about exactly what is going on. The fifth column break into the laboratory and blow it up - the film ironically ends with the talkative worker wondering who "talked too much".