Gregory Thorne and Marta Milbanke are engaged. Their fathers are millionaire ship owners. Gregory's efforts to inject a little excitement into their engagement life are fruitless, but when Mr. Milbanke receives an anonymous letter which threatens disaster to his home and fortune if he permits a shipload of supplies for the Allies to leave the docks the young man sees an opportunity for creating what he longs for and tells Mr. Milbanke that he knows who has written the letter but that he will not divulge the man's identity. Gregory, who suspects Count Hilgar Eckstrom, is told that he must terminate his engagement with Marta. But this is what Gregory wants, so he plans to abduct his sweetheart. Gregory's men clash with Eckstrom's gang, who has also come to kidnap Marta, and the disturbance results in the arrival of the police. Marta by mistake, allows herself to be carried off by Eckstrom's men and is taken a prisoner. Gregory, following, is also made a captive, and the young people are held as hostages. How Gregory outwits Eckstrom and places him and his gang in the hands of the law brings about a startling climax.