The year is 1944. The allies have landed in France. In an underground factory placed securely in the middle of Germany, the Nazis are manufacturing weapons of retaliation. The forerunners of the modern IBM, the V2 rockets, are being fired at London, and against them there is no defence. Reports reach the British intelligence service that the rockets are to be fitted with nuclear warheads and the only way of averting the threat is direct sabotage against the well-protected factory. Thanks to his half-German background, Commando Michael Saunders is the right man for the job, and it is for personal reasons that he accepts the mission. Nurse Hilde Baier’s position in the high-security zone creates an unexpected opening for Michael to sneak into the heavily guarded compound. Hilde is torn between conflicting loyalties as she is forced to choose between her love for her family and her love for Michael.