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Project M7 is the American title for the British The Net. Based on a novel by John Pudney, the film is set in an aviation research station. At the moment, the researchers are working on a revolutionary new aircraft, and competition to be first with the results is fierce. There's little love lost amongst the scientists, but no one expect the personal animosities to result in murder. The killing in question was committed by an enemy spy...but which one of the scientists is the guilty party?