Wartime drama co-written and directed by Vernon Sewell and Gordon Wellesley. During the Nazi's early occupation of Holland, they seize the country's largest shipyard hoping to turn it into a production line for their U-boats. The shipyard's owner, Jaap Van Leyden (Ralph Richardson), is ordered by German enforcer Von Schiffer (Esmond Knight) to collaborate and help with U-boat production. But unbeknown to the Gestapo, Van Leyden is in fact a hero of the local resistance, and sets in motion a covert plan to strike back against the Nazi's production line. Googie Withers co-stars as Jaap's wife Helène.