William is a city dweller accustomed to his job as a client adviser in a bank, but also to easy and quickly prolific evening adventures. Confident of him, he never misses an opportunity to seduce the ladies around him. But his reunion with an old study friend caught in the act of adultery by his wife, and a vacation as unexpected as country, in the heart of a family of 4 sisters, their respective spouses, their flock of children and a few other patches, will put him to the test and capsize his certainties about his power of seduction.