The Key to "Sarah's Key"

For Gilles Paquet-Brenner, the French filmmaker best known for for Pretty Things (2001), his good twin/bad twin thriller starring a relatively unknown Marion Cotillard, it was time to make something more "substantial." He was 33 when he read Tatiana de Rosnay's novel "Sarah's Key." The story of French Jews rounded up in Nazi-occupied Paris was a coup de foudre, a thunderbolt, to the heart.