Three married couples get together in a country house to celebrate the forty-eighth birthday of one of them. For everyone, it’s a chance to briefly step away from the children, endless bills, and elderly parents.
After an evening in a bar, the birthday boy suggests a game—just for one night, swap partners. It seems no one takes the idea seriously, but at some point, several people disappear from the library. The next morning, no one mentions what happened. But the birthday man’s wife now won’t speak to him, his friend looks at him strangely, and it seems everyone knows a little more than he does himself. So what happened that night? And what will it turn into for each of them, in those evenings that someone can’t remember and someone can’t forget?