One of the darkest moments in French history occurred in 1942 Paris when French officials rounded up over 10,000 Jews and placed them in local camps. Eventually, over 8,000 were sent off to German concentration camps. As 10-year-old Sarah (Mélusine Mayance) and her family are being arrested, she hides her younger brother in a closet. After realizing she will not be allowed to go home, Sarah does whatever she can to get back to her brother. In 2009, a journalist named Julia Jarmond (Dame Kristin Scott Thomas) is on assignment to write a story on the deported Jews in 1942. When she moves into her father-in-law's childhood apartment, she realizes it once belonged to the Strazynski family, and their daughter Sarah.