Rose Zar was born Ruszka Gutterman to a Jewish family in Poland. During World War II, at age 19, she fled her home in the Piotrokow ghetto and survived the Holocaust by passing as a non-Jew, obtaining false papers, and constantly changing her identity. She did many different jobs, including working as a nanny for a Nazi colonel. After the war, she emigrated to the USA. She published her memoir, In the Mouth of the Wolf, in 1992.