A tense WWI spy thriller in which Colonel Duncan Grant (British star Brian Aherne, in his first talking role), parachutes into Germany to gather intelligence on the enemy’s secret ‘W Plan’ and to assist Allied POWs in digging escape tunnels.

Produced by the highly acclaimed Michael Balcon, the story revolves around Robert, the son of the owner of a musical instrument factory. He is in love with Vera, one of the factory workers, who is unaware of his position. So when she jokes one day that she would love a Rolls-Royce, Robert makes sure that she gets one. Then he decides to raise her salary out of all proportion to hint at who he is...