In January 2003, among an assortment of greeting cards, Anne Berest found a strange, anonymous postcard in her mailbox. On one side was an image of the Opera Garnier, and on the other, the names of four members of her family who died in Auschwitz in 1942. Twenty years later she decides to investigate, retracing the Rabinovitch’s extraordinary destiny with the help of her mother, a private detective, and a criminologist. Anne Berest also seeks to understand how her grandmother, Myriam, was the only one to escape deportation.