The story takes place during World War II, when the Germans occupied Paris. Klein (Alan Delon Alain Delon) is mistaken for a Jew of the same name. He must rely on his own strength to prove his lineage, or he will face a tragic fate. After much hard work, Klein finally found out the home address of Klein, a Jew. To his surprise, the address pointed directly to his own home. All the clues suggest that Klein seems to be caught in a long-planned trap, and every clue he thinks he can get the truth from is finally dissipated in the wind like spider silk. Although lawyer Pierre (Michael Lonsdale Michael Lonsdale) actively helps Klein, in the end he is unable to unravel the secret between his background and the name.
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