I recently finished reading for my book club, Sarah's Key by Tatiana de Rosnay. I've read quite a few World War Two accounts both fictional and non-fictional, and this one was very poignant indeed. I do think that I found the first part of the book more interesting than the second as you got to see both points of view of what happened from present day to the past.
Though not my favorite book of those times, this one will still get to you, right in your heart.
Synopsis: Paris, July 1942: Sarah, a ten-year-old girl, is taken with her parents by the French police as they go door to door arresting Jewish families in the middle of the night. Desperate to protect her younger brother, Sarah locks him in a bedroom cupboard—their secret hiding place—and promises to come back for him as soon as they are released.