Sequel to The Mouse that Roared; The Tiny Country of Grand Fenwick has a hot water problem in the castle. To get the money necessary to put in a new set of plumbing, they request foreign aid from the U.S. for Space Research. The Russians then send aid as well to show that they too are for the internationalization of space. While the grand Duke is dreaming of hot baths, their one scientist is slapping together a rocket. The U.S. and Soviets get wind of the impending launch and try and beat them to the moon.

On a vacation in France from his nondescript job and life, John Barratt encounters a titled but impoverished French nobleman who looks exactly like him. The nobleman gets John drunk, and switches places with him to get a breather from his failing business and too-complicated life. John tries to convince everyone he is not whom they think he is, but he begins to get more and more involved with the family, including an unhappy wife, domineering mother, lonely but talented young daughter, bitter spinster sister and the expected mistress. As John gets to know them he feels he can help them with their problems, but is also becoming used to his borrowed life, which has given him a purpose for the first time.

Wallace and Gromit have a brand new business. The conversion of 62 West Wallaby Street is complete and impressive, the whole house is now a granary with ovens and robotic kneading arms. Huge mixing bowls are all over the place and everything is covered with a layer of flour. On the roof is a 'Wallace patent-pending' old-fashioned windmill. The transformation is perfect. Although business is booming, Gromit is concerned by the news that 12 local bakers have 'disappeared' this year - but Wallace isn't worried. He's too distracted and 'dough-eyed' in love with local beauty and bread enthusiast, Piella Bakewell, to be of much help. While they enjoy being the 'Toast of the Town', Gromit, with his master's life in jeopardy, must be the sleuth and solve the escalating murder mystery - in what quickly becomes a 'Matter of Loaf and Death'.

Mystery abounds when it is discovered that, one by one, the greatest Chefs in Europe are being killed. The intriguing part of the murders is that each chef is killed in the same manner that their own special dish is prepared in. Food critics and the (many) self-proclaimed greatest Chefs in Europe demand the mystery be solved.