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Sylvia Martin, a poor shopgirl, runs away from her abusive father and almost succumbs to the cold on the doorstep of Louis Gordon, a crook. They marry, but later when faced with capture, Gordon kills himself. Gordon's gang accuses Sylvia of murder, and although she is acquitted for lack of evidence, her name is included in the Police Index. Years later, upon finding the Index on the shelf of her second husband, Washington diplomat David Maber, Sylvia fears exposure. Her fears heighten when her arresting officer, John Alden, now chief of the Secret Service, tries to induce her to entrap a Bolshevik agent, Hugo Declasse, who is attracted to her. When Alden appeals to patriotism, she acquiesces. Declasse finds the Index and threatens to expose her unless she cooperates in getting plans for an uprising to London agents, but Declasse is foiled when his trusted Japanese butler turns out to be a Secret Service agent. Maber, learning of Sylvia's past, forgives her.