Sarah's Key by Tatiana de Rosnay

Sarah is a ten year old child who gets swept up in 1942 when the Paris police (at the behest of the Nazis) round up thousands of French Jews and send them off to Auschwitz. Sarah's story is interwoven with that of a forty-five year old American woman living in Paris in 2002. Julia is a journalist assigned to write up the story of that roundup of Jews. She stumbles across the start of Sarah's story and refuses to rest until she has chased down what happened to Sarah and her family. Excellent novel for anyone who enjoys family stories mixed with real history.