Claude Géraudy, a banker responsible for a financial scandal, is forced to flee and hides in the mountains with the help of Manu, a young smuggler. Florence, his wife, refuses to join him. Desperate Claude commits suicide, Florence then decides to pass her suicide off as murder in order to receive her late husband's life insurance.
The basic premise: A retired bus driver fulfills his lifelong dream of providing an extended "voyage surprise" (the title is translated as "Mystery Tour") for unsuspecting vacationers. They soon realize, while riding in the old man's home-made bus, that he hasn't bothered to plan any kind of itinerary. As a result, they end up in completely preposterous situations, of course. Voyage surprise!
When a measles epidemic forces the temporary closing of a child care center, the son of a film star and her estranged husband, a concert pianist, is mistakenly delivered to a touring musician.
