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The Great Deception is set during WWI. Educated in Germany, British youth Cyril Mansfield (Ben Lyon) is seemingly uncertain of his loyalties when the War breaks out. Refusing to enlist in the British army, Cyril is accused of being a slacker and a coward. He then commits the ultimate betrayal by selling his services to the Germans. What none of Cyril's friends know is that he is secretly in the employ of British intelligence, pretending to be a spy for the Kaiser in order to get his hands on the enemy's secret war plans. His true purpose is revealed when his girlfriend Lois (Aileen Pringle) is kidnapped by German agent Von Markow (Lucien Prival).