It stars Jean-Pierre Léaud as a car-obsessed young man trying to get possession of a Porsche for a race.

In the process he meets an attractive girl called Michèle, who supports his plan, and the two end up shut inside the Brussels Motor Show for the night.

His next idea is to approach a client of the salon, a rich older woman who has a Porsche, and try to charm it from her.

Abandoning that line of attack, he learns that he cannot rent a car because he is too young and then he fails to steal one in the street.

The film ends at that moment, leaving viewers to assume that Marc is going to find a relationship with Michèle more rewarding than rallying.