Following the death of his father, Frederick III of Germany, Wilhelm Hohenzollern becomes the German Kaiser and forms a pact with the devil that he will conquer the globe in exchange for his soul. During the Kaiser's invasion of Belgium, the Crown Prince enters a church and rapes Ruth Monroe, the daughter of an American inventor who has perfected a noiseless communications device. When the professor denounces the Crown Prince, he immediately is shot, whereupon his other daughter Alice vows to obtain revenge. While Alice's sweetheart, Winslow Dodge, fights with the Americans as an aviator, she arranges to meet the Crown Prince through her friend Robert Graubel, an actor who impersonates the Kaiser at public functions. With her father's wireless, Alice informs Winslow of the Kaiser's whereabouts, and as he captures the German emperor, she kills the Crown Prince. Now a prisoner, the Kaiser drowns himself and wakes up in Hell, where Satan abdicates in his favor, saying that the Kaiser's tortures are more fiendish than any he ever devised.
—AFI