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A group of scientists are cloaked in a veil of high security as they work on a top secret hydroplane which will fly at three times the speed of anything else. Donald is the inventor who wants to take the plane out himself for its first test run. His supervisor discourages Donald, declaring that he is too valuable a man to have his life risked, and the supervisor volunteers to take it up himself. Before he can do so, he is found dead, and secret documents are known to have leaked out of the camp, instigating a search for the possible traitor. Asquith does a fine job of depicting a group of men so caught up in what they are doing that they are oblivious to everything else. He keeps the tension mounting as the men are faced with the possibility that their project may fail.