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Sonia Varinoff (Mae Murray) travels from Russia to New York to be with her father, who is a librarian for Schuyler Van Vechtan (John Miltern). Sonia, however, is a flighty young girl who does not share her father's bookishness. She falls in love with Peter Derwynt (David Powell), the secretary of Van Vechtan, and causes him to lose the girl he loves, Lady Joane Tremelyn (Alma Tell), to wealthy Jimmie Sutherland (Robert Schable). Peter marries Sonia only because he feels sorry for her. Jimmie and Sonia eventually meet, and on the sly, she becomes a masked cabaret dancer. Peter discovers the affair and part-time job, but she retorts that he has been romancing Joane. In a fit of anger, Peter kills Jimmie, and even though she knows that it will ruin her reputation, Sonia testifies so that Peter will be acquitted. She then leaves him so that he can marry Joan. But Sonia doesn't wind up alone, she finds a mate in Van Vechtan.