- During World War I, a group of German saboteurs plot to blow up an ammunition dump in New York City. A secret agent sets out to stop them.
- Curtis Prescott is employed by Van Brunn, an Amsterdaym diamond merchant. Van Brunn's "Kimberly" diamond is wanted for the British Crown. Prescott is instructed to take the diamond to London. Johan, a member of the Wade gang, follows Prescott. On the boat Carroll of the Secret Service is discovered to be a beautiful girl. Prescott deposits the diamond with the purser. The Wade gang capture Carroll, while the leader secures the diamond. Sylvia and Prescott have become friends. After the robbery the girl manages to attract the attention of the steward and is rescued. Wade is captured and the diamond taken from him. Fay, another member of the gang, discovers that Prescott has a valuable diamond. The gangsters steal it. It is "The Kimberly." Prescott had placed a fake diamond in the purser's care. Hemming, of Scotland Yard, boards the vessel when it reaches Liverpool and arrests Prescott for the murder of Van Brunn. The detective ridicules the work of Sylvia. Sylvia tells Prescott she believes in him and promises to help him. Hemming arrives in America, appeals to the Secret Service Chief and Sylvia is detailed. She meets Prescott and he informs her he managed to escape from England. Martin, Fay and other gang members attracted by a newspaper story to the effect that a Western millionairess wishes to buy diamonds, calls on Sylvia and discovers her identity. Sylvia discovers the gang's headquarters. Prescott is made a prisoner by the gangsters. He manages to cut his bonds and is leaving when Hemming appears and Prescott receives a wound on the head. Sylvia seeks to hide Prescott. Sylvia pleads with Hemming to permit her to visit a saloon where the gang will meet. Hemming refuses. Sylvia disguises and goes to the hang-out. She meets Fay and learns of a later meeting. Hemming arrests Fay. At the station Fay is confronted with Prescott, whom Hemming believes a gang member, but she does not know Prescott. Sylvia enters with other gangsters whom she has captured and shows the diamond she has taken from them. Fay confesses as to the murder of Van Brunn. Sylvia approaches Hemming, takes out her knitting, places it in her hands and says, "Just a souvenir that even knitting comes in handy. As far as the world will know, you and I worked on this case together."
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