Compulsive gambler Charlie Gordon cons his brother-in-law, widower Herb Sullivan, whose wife Susie was Charlie's sister, into an all expenses-paid luxury Holland America Mexican cruise. The catch, which Charlie does not reveal to Herb until the ship has left port, is that they are required to work as dance hosts. They must sleep in a cramped cabin in the bowels of the ship, and if they do not dance, they will get fired and have to pay nearly $3,000 (later Herb finds out it's really over $5,000) for the cruise or get thrown off the ship.