Allied agents infiltrate the Nazi rocket complex at Peenemunde in order to obtain their secrets and sabotage the plant. The film alternates between German developments of the V-1 missile and V-2 rocket (with a German cast speaking their own language) and discovery by British Intelligence of the weapon.

A college professor begins to suspect that a student's accidental death was tied to his refusal to take part in a traditional "hazing" and was no accident.

Pursued by the big-time gambler he robbed, John Muller assumes a new identity—with unfortunate results.

Czechoslovakia, March 1939, on the eve of World War II. As the German invaders occupy Prague, inventor Axel Bomasch manages to flee and reach England; but those who need to put his knowledge at the service of the Nazi war machine, in order to carry out their evil plans of destruction, will stop at nothing to capture him.