Mr. Bennett wants Tony Queen to advance him five thousand dollars to stuff in an envelope — part of a con to cheat Miss Emily out of her investment in the show. Chester has cooked up a similar swindle involving the switching of envelopes for Stan and Ollie to carry out on Mr. Bennett.

It's time for the envelope routine and both groups are sure they've pulled a fast one. Miss Emily proposes a drink to celebrate while Chester takes the envelope to the hotel safe.

When ​Bennett open​s​ the envelope​,​ Stan and Ollie make a hasty getaway — but not fast enough. Tony Queen plans on turning the showboat into a ​casino, which will include ​roulette and ​the bird cage (a game played with three dice)​. Queen also has plans for Susan.

Ollie is tasked with shoveling coal into the boiler to heat the riverboat while Miss Emmie (Stan) gets to sit it out. Susan entertains the nightclub patrons with a musical number.

The pills meant to turn water into gasoline were a bust, but they come in handy for Stan, Ollie, and Susan. Some of their problems just float away.

The guard in the engine room accidentally causes the nightclub riverboat to set off at full speed and chaos ensues. Chester comes to give Susan some welcome news, while Stan and Ollie end up in the Mississippi River.