The cheapest family in the world decides to go on an off-brand cruise in this wacky mystery/adventure story.

Mr. Pennypacker is cheap. But Mrs. Pennypacker has wrestled money for a vacation from his tightfisted grip, and the family is on their way to a Disney cruise. Charlie Pennypacker is thrilled to be going somewhere—an eleven story luxury cruise liner, 212-foot water slide, and an all-night buffet awaits!

So Charlie thinks. The vacation is actually a Wisney cruise, which means a dilapidated fishing boat, fake Disney characters, no water slide, eggs for every meal, and his enemy Gunter Hwang, who has been brought along for thirty dollars a day. On top of that, the captain is on the run from sinister men in dark suits.

It's a Caribbean game of cat and mouse involving wits, interrogations, a hidden room, races against time, and clever deceptions. As Mr. Pennypacker would say, you can't get this kind of adventure on those other overpriced cruises.