NEW YORK - What happens when one of most brilliant people in the 20th century didn't leave a trace? And what if the closer you looked, the harder you researched, the more he vanished? That's the puzzle at the heart of "The Shoshani Riddle," French-Israeli director Michael Grynszpan's documentary, making its U.S. premiere at the Israel Film Center Festival at the Marlene Meyerson JCC in New York City on Sunday.

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