Five married men secretly share a loft where they stylishly and peacefully receive their mistresses and latest conquests. A fine arrangement, until one winter morning they find the body of a young woman. None of them know who the woman is, where she comes from and how she ended up in a loft that only they own the key. Out of necessity, the friends try to find out what happened and why, but they soon begin to mistrust each other and it will turn out that they know a lot less about each other than they originally thought.