What would you do to get rid of your wife's new husband? The protagonist's answer is "quite a lot". The plot is interesting but marred by a certain inability of keeping up the tension, by a slow pace and by unremarkable performance of the protagonists, all in "ohh" and "ahh" but without the depth required by their supposed turmoil. Bruno Ganz does hovewer an excellent job of his modest part of decent man witnessing the unthinkable. Also, the atmosphere is pleasantly gothic.
Georges Perec worked on the dialogues. Given the talent involved, this film could / should have been better. It remains watchable, but not much more.