In spite of Helen's advice, Henry, the relief operator, decides to give up his position and go to the city. There the boy falls in with a gang of wire tappers. Thomas, the chief of the gang, learns that the results of the following day's races are to be sent on wire 35. Three men, headed by Jim Noyes, proceed to Rexford to tap this wire. Their presence is discovered by a lineman. To keep their plot secret, the wire tappers make him a prisoner. Helen learns of what has taken place. She severs the wire being tapped. The wire tappers discover her presence and give chase. Helen, however, secures the assistance of the crew of a freight train. Outnumbered, the criminals steal a gasoline speeder and flee. Uncoupling the engine from the freight train, Helen and the train crew pursue. Seeing the girl on the engine, Noyes levels his pistol to shoot, but Henry knocks the weapon up. Angered, the wire-tapper hurls the boy from the speeding car. Helen rescues him and then continues the chase. In danger of being run down by the locomotive, Noyes surrenders. The man is placed under arrest. Henry, realizing the error of his ways, promises to return to his former position.
—Moving Picture World synopsis