1943: A schoolmaster called Stefan Novak (Michael Rennie) and his watchmaker friend Tadek (David Knight) are working for the Polish resistance lead by Stanislav Muski (Peter Madden) and allow themselves to be captured by the Nazis and taken to a labour camp on the Baltic coast so that they can spy on the operations there. Stefan and Tadek discover that the camp houses a huge production unit where the V1 rocket is being built, which Hitler intends to use to destroy London. The pair succeed in informing the resistance of what is happening who in turn tip off the allies who launch a full scale raid on the plant and destroy it therefore setting back the Nazis' plan by months. However, the fight is far from over as Hitler's generals proceed with plans to build yet another plant and Stefan and Tadek are faced with a dangerous challenge, they must capture a complete V1 rocket and help in smuggling it back to Britain so that the allies can prepare themselves for Hitler's proposed invasion.