Dick Benton is making a game attempt to start life all over again, after escaping from prison where he was confined for a crime he did not commit. "Peeler" White, who was really guilty, and who aided Benton to escape without telling the reason for his interest, stumbles across the young man who is now an express messenger. "Peeler" threatens to disclose his knowledge unless Benton aids him in a fake hold-up. The young man pretends to be a willing victim, but really warns the railroad detectives and "Peeler" and his companion find themselves in a trap on the train the following day. They turn the tables on the sleuths, however, and throw one of them from the speeding train. The detective succeeds in sending a warning down the line, and when Helen receives it she decides to make a bold attempt to capture the culprits. Speeding to the bridge, she arrives there before the train and drops to the top of the onrushing cars. Throwing a noose of the rope she carries over the ventilator of the baggage car she then swings through the air and in the door of the car. Covering the crooks with her revolver she signals ahead to the engineer and the train is brought to a stop. The capture of "Peeler" also results in clearing up the mystery of the crime for which Benton was jailed.