In the silent era, most films were made on the back lot and this one, based on the book by Valentin Mandelstamm, was a novel exception. It was shot on location in Paris, Monte Carlo and the Riviera with both American and French actors. Handling the megaphone was well-known French director Leonce Perrett. When Matthew Versigny (Robert Elliott) discovers that the jewels his diamond company has been buying are fake, he travels to Europe to track down the counterfeiter. With him are his sister, Marguerite (Lucy Fox) and her sweetheart, Paul Bernac (Henry G. Sell), who is an agent in the French Secret Service. Arthur Graves (Leon Mathot), who has been making the fake diamonds, captures Versigny and makes it look as it he is the counterfeiter. Marguerite and Bernac rescue him, and they follow Graves to the island where he has fled. ~ Janiss Garza, Rovi