While the Nazis are busy deporting French Jews from occupied France, a Parisian art dealer discovers that he has a Jewish counterpart with the same name, for whom he is mistaken. As he becomes more involved with his alter ego's identity, Mr. Klein (Alain Delon) puts himself at considerable risk.
This was a very interesting film and as good as any by Joseph Losey. I think it's probably one of the best roles I've seen Alain Delon in and it deals with a very serious, often unexplored topic, the level of collaboration in France under German occupation. Beautifully filmed and well paced and I think there should be a special mention for its setting in old Paris and the gorgeous 1930s costumes. Like many Losey films, I feel I could watch this many times.
I agree with the above, the film has haunted me for days. There is perhaps an artificial feel about the use of old Paris settings, but the topic is very interesting and ultimately tragic; pretty special acting too by everyone involved.