'I'll come back for you later. I promise.'

Paris, July 1942: Sarah, a ten year-old Jewish girl, is arrested by the French police in the middle of the night, along with her mother and father. Desperate to protect her younger brother, she locks him in a cupboard and promises to come back for him as soon as she can.

Paris, May 2002: Julia Jarmond, an American journalist, is asked to write about the 60th anniversary of the Vel' d'Hiv' - the infamous day in 1942 when French police rounded up thousands of Jewish men, women and children, in order to send them to concentration camps. Sarah's Key is the poignant story of two families, forever linked and haunted by one of the darkest days in France's past. In this emotionally intense, page-turning novel, Tatiana de Rosnay reveals the guilt brought on by long-buried secrets and the damage that the truth can inflict when they finally come unravelled.