A gang of river pirates take over the paddle-wheeler Dakota Queen and relieve the passengers of jewels and furs and Bat of $10,000. Bat uses a barrel of rare cheeses to trap the gang's gluttonous leader to recover the items.

Bat is cheated at cards by a town boss with the cooperation of the local sheriff. When he meets a brother and sister who were cheated in a land swindle, they three plot to get their money back and bring the crook to justice.