Zelda Dunbar, a detective, on the trail of two notorious blackmailers, offers herself as their accomplice and is accepted by Eldridge and Mortimer. Zelda wins the heart of Kendrick, a rich bachelor. Zelda slips Kendrick a note saying her father is going to force her to marry a man she does not love. Kendrick takes the girl into another state. At a hotel the pair are confronted by the two blackmailers and Eldridge charges Kendrick with violating the Mann act. Kendrick is arrested. A mob threatens to lynch him. Mortimer urges Kendrick to settle for $20,000. On a signal from Zelda he does so. The crooks attempt to escape, but are prevented. The mob bursts into the room. Zelda shows her star, explaining she has been seeking evidence against the men. Zelda confesses her love for Kendrick.
—Moving Picture World synopsis