This movie is casted with the best french actors of the time ; everyone of them made a sparkling career : Danièle Darrieux, Paul Meurisse, Lino Ventura, Bernard Blier, Paul Le Guers, Sege Reggiani, both in movies and theater. Many are second roles performers who illustrated themselves in mystery movies. The dialogues are witty; may be you have to know french to appreciate it to the most. The violence is in the heavy atmosphere unlike actual movies,although some scenes are physical.The plot is intelligent like an Agatha Christie and well organized by the Director. Jean Duvivier is one of the best of his generation. I would recommend it to any movie lovers.