In WWI,German intelligence sends a team of saboteurs and a female spy to Scotland to kill Lord Kitchener. Also, German intelligence sends another team of spies to Allied headquarters in Belgium to steal the secret Allied defense plans. German female spy, known as Fraulein Doktor, is tasked with stealing the new mustard-gas formula from its French female inventor. The German army plans to use the new French mustard-gas on the battlefield during the upcoming German offensive against the Allied armies.