When Eve De Montalais (Lois Wilson) plans to smuggle her jewels into the United States, unknown to her traveling on the same ship are a gang of thieves who plan to steal the jewels. Michael Lanyard (Bert Lytell), alias The Lone Wolf, upsets their scheming and Eve seeks his aid in getting the gems past customs officials. While at a New York nightclub, Eve is informed that Lanyard is The Lone Wolf. She is then duped by a crook who assumes the role of a customs officer and induces her to turn over the jewels, Eve then escapes upon discovering the deception. Lanyard is overpowered by the gang but manages to free himself and declares the jewels to customs officials, who then promptly arrest the thieves. Eve is relieved to find that Lanyard is a Secret Service agent, and the lovers are reunited.