In 1917 London, elusive German spy Frantz Strendler regularly accesses crucial British military information and relays it to the German government, resulting in disastrous consequences for the British on the front lines. British intelligence is forced to scramble to uncover the master spy, who is hard at work expanding his own reach. Cast: - Boris Karloff as Valdar, aka Franz Strendler - Margaret Lindsay as Helene Von Lorbeer, aka Frances Hautry - Bruce Lester as Frank Bennett - Leonard Mudie as Colonel James Yeats - Holmes Herbert as Arthur Bennett - Austin Fairman as George Bennett Runtime: 60 minutes.