Plot: At the height of WWII, in Nazi-occupied Paris, the charming French opportunist and unscrupulous art dealer, Robert Klein, leads a life of luxury, benefiting from the volatile wartime situation. Against the backdrop of systematic deportations, the rapacious Mr Klein makes an enviable living by exploiting the desperate French-Jews who sell their paintings and valuables for peanuts, until the accidental delivery of a Jewish newspaper to his doorstep. Under those circumstances--as Robert tries to get to the bottom of this embarrassing and life-threatening misunderstanding--somewhere in the war-torn city, another Robert Klein of Jewish descent is threatening the real Klein's identity and well-being, bringing him to the attention of the police. However, who is Robert's mysterious doppelgänger? Will Mr Klein ever clear his name?
Alternative Plot: In Occupied France, Mr. Klein (Alain Delon) exploits the situation of the Jews by buying and selling their works of art. When a Jewish man of the same name surfaces in Paris, Klein comes under suspicion and experiences the persecution of his countrymen firsthand.
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