Tweedledum learns of a wealthy man who is held for ransom by an adventuress, and when she attempts to beguile another victim he warns him, and, playing detective, impersonates him. The woman overhears the plot, and when Tweedledum calls she dresses in male attire and engages him in conversation. Suddenly a trap door opens and Tweedledum is dropped to the cellar, placed in a sack, and cast in the river. He manages to free himself and disguised as the maidservant, effects an entrance, arrests the woman and releases the imprisoned man.