Alain Delon plays Mr. Klein, a French-Catholic art dealer during the Nazi occupation. Strapped for cash, Klein takes financial advantage of his Jewish neighbors, knowing that they have no legal recourse. Ironically, Klein is himself mistaken for a missing Jew, a man who has been using Mr. Klein's name as a cover for his secret operations. As he desperately seeks out that man, he learns a bitter lesson about life in the other man's shoes. Star Delon is one of the four producers of this French feature.