Sarahs Key by Tatiana deRosnay

Sarahs Key is AWSOME!!! It's told from two stand points in time, one current and one as it happened in the past. Sarah is a young girl whose family must go into hiding as the Jews are being rounded up. She hides her young brother in the secret cabinet in his room & tells him she will be back for him shortly. Years later, her story comes to light as a writer uncovers it, and many secrets in her husbands family.