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A cunning German spy and physician named Fraulein Doktor (Suzy Kendall) attempts to assassinate British Field Marshal Lord Kitchener during World War I. But when her team is captured by the enemy, Doktor manages to escape with the knowledge of Kitchener's whereabouts. During her exploits in Russia and Spain, Doktor discovers the formula for a horrendous poisonous gas. And the German plan is to release the gas on Allied soldiers during trench warfare. Wikipedia