During World War I, John Stevens invents an anti-submarine device, but the plans are stolen by two German spies, the Baron von Wiederholtz and Madame Elsa, who flee to a New York hotel. Stevens' daughter Alice pursues the spies hoping to retrieve the plans.

Helen, a "diamond runner," reaches South Africa.

Helen, the telegrapher at Downing Junction, receives word that an engineer has been accidentally shot by a partridge hunter, and the runaway train will collide with the Eastbound Express. Helen jumps onto a nearby standing locomotive, opens it up full throttle, catches up the Express, warns the engineer of the impending danger

With ruin staring him in the face, Manning, of Manning and Company, commits a theft which averts the crash. The scoundrel cleverly contrives to throw suspicion upon Reynolds, an old and faithful employee. Reynolds receives a three-year sentence. Beatrice, the daughter of Manning's victim, believes in her father's innocence. Led to believe Manning the real cause of her father's tribulations, Beatrice vows to wreak vengeance upon the scoundrel.

It shows how a scheming bank employee manages to get an alibi and fix the guilt of his theft on the assistant cashier.