The story is an investigation on a murder. From the beginning, the dialogues are very strong and punchy for every character, but especially for the policemen, and very especially for Yves Deniaud, so funny, just love him. And the director seems to have fun directing his actors with such caustic dialogues. The punchy dialogues by M.G. Sauvajon makes me think of dialogues by Michel Audiard. We even hear an expression used by de Gaulle during may 1968 and used the same year by Audiard for the title of his movie. I strongly recommend "Ouvert Contre X..." so entertaining.