Robert Simonet (Jean-Marc Thibault), a hard-working but good-hearted little garage owner, has spent a hard night on fixing in due time a car which he then has to tow away from the road in the early hours of this Saturday, completely wrecked in a crash by its careless speed-crazy driver. Upset by this event and by the coming cycle race where he is a favorite, he miss the German patrons who are back to take their car. They leave the town, but the direction of their Mercedes is not thoroughly repaired.