 London airdrops a man codenamed Hercules near the camp. At the same time General Stauffen will be conducting an inspection of Stalag 13. Hercules  mission is to switch his briefcase with Stauffens. Stauffen is part of the plot to assassinate Hitler and Hercules  briefcase is equipped with a time bomb. Everything is proceeding as planned until Schultz unknowingly arms the bomb.