Benton, the express messenger, is known to be in money troubles, so that, when he disappears with a valuable package, circumstantial evidence points to his guilt. Helen, while delivering a telegram on motorcycle, is crossing the drawbridge when she finds the missing package. A wharf gang, which has secreted the package there, pursues to recover it, while one of their number raise the bridge to prevent Helen's escape. But that plucky girl dives to the river, and swims ashore, to her motorcycle. The pursuers follow in an automobile. Coming to a flimsy wooden bridge over the railroad tracks they attempt to cut her off, and Helen swerves aside and crashes through the rail, barely missing the wheels of a speeding train. The trainmen come to her aid and capture the wharf gang. The third degree brings out the fact that Benton had fallen from the express car at the bridge and been rescued by the wharf men who made him a prisoner in their cabin. His delirious ravings about the valuable package caused them to secrete that until a favorable opportunity came to dispose of it.