London, 1953. Louise is still adjusting to her postwar role as a housewife when she discovers a necklace in a box at a secondhand shop. The box is marked with the name of a department store in Paris, and she is certain she has seen the necklace before, when she worked with the Red Cross in Nazi-occupied Europe --- and that it holds the key to the mysterious death of her friend, Franny, during the war. Following the trail of clues to Paris, Louise seeks help from her former boss, Ian, with whom she shares a romantic history. She races to find the connection between the necklace, the department store and Franny’s death. But nothing is as it seems, and there are forces determined to keep the truth buried forever.