On a whim with my family I saw Sarah's Key. I was just blown away with the whole story. Starting in modern day Paris, where journalist, Julia Jarmond, investigates the French Round Up (the French version of the Holocaust.) Jarmond focuses in particular on the story of a young jewish girl, Sarah, who lived in the house her family now owns.
The movie then moves from Jarmond's investigation to Sarah's life in 1942 where she desperately tries to return to her home in Paris to save her brother who is locked away in the hidden door of their home.
Even better yet, for my French nerds out there, is that the movie is in both French and English. It switches simultaneously and the flow is really nice between both languages. There's subtitles too, so don't get weirded out if you don't know French. Just go see it.
Here's the trailer.