Looking for a flat to rent, Benoit is staying temporarily at a hotel. Having seen that flats are more easily rented to couples than singles, Benoit comes up with the plan to have Jeanne, his neighbour, act as his girlfriend. Through this role play, Benoit will fall under the charm of this young lady who is keen on horse betting, and will let himself be led into an amorous bet that will ruin him.

Benoît loge provisoirement dans un hôtel. A la recherche d'un appartement il va élaborer un jeu de rôle avec Jeanne, sa voisine de chambre, pour pouvoir acquérir un appartement plus facilement… Mais Jeanne n'a pas la même notion du jeu que Benoît.