Dancing star Irene Castle was the leading lady of this combination murder mystery and espionage melodrama. Somewhat unconvincingly cast as the 19-year-old daughter of a wealthy shipyard owner, Mrs. Castle plunges into the thick of the intrigue when she champions the cause of her dad's secretary, who has been accused of murder. The guilty party turns out to be a German spy, who has been planted in the shipyard for sabotage purposes. Joining forces with a U.S. secret service agent, the heroine puts her own life on the line to thwart the spies. The screenplay was the handiwork of Ouida Bergere, better known to film enthusiasts as the wife of actor Basil Rathbone. ~ Hal Erickson, Rovi