A series of murders is committed in Nice on the French riviera. The commissaire Carella is in charge and tries to find a missing link between all these murders.
Without Apparent Motive is a 1971 French thriller film directed by Philippe Labro and adapted from the 1963 novel Ten Plus One by Ed McBain. Set in Nice, it tells the story of a police detective faced with a series of unexplained killings of apparently unconnected people by a mystery sniper.