An exceptional movie construction, masterminding the script, the actors, the music and the location. Each scene, per day and murder, and each actor's performance leave vivid pictures in my mind: the plunge in the swimming-pool, the deceived look of Gravina in her love-sex affair with Trintignant, the full power run of Trintignant around the Nice harbor, the final death posture of the murderer. Jean-Louis Trintignant camps a local French Riviera inspector, very self-image oriented as are most of the featured residents of the Cote d'Azur. A series of murders with no evident link is followed by Trintignant, each one filling a piece of the puzzle and bringing him closer to the murderer. Labro, the film director, shoots real-street-life and picks up the best essence of each of his actors. Beyond Trintignant, each other actor seems to have the second role while playing their cast with their own personality. Labro could have been another Jean-Pierre Melville and his magnificent "Le Cercle Rouge". This "Sans Mobile Apparent" showed all the promising ingredients needed by the French cinema to find a respected place in action movies. Labro followed up with "l'Heritier", not bad, far not as good, the magic having disappeared. My biggest regret: "Sans Mobile Apparent" is as yet unavailable in DVD and does not play on TV anymore.