Commander Gerard and his band of guerrillas have found the ideal hideout: a nursing home in the Alps where, along with the mentally ill, are also hiding a Jewish girl and a Swiss doctor who might be a spy for the Germans ...
Hopes and love and ambitions and friendship in a group of young jazz-loving Parisians.
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!
