What is the theme in Under a Cruel Star: A Life in Prague 1941-1968 by Heda Margolius Kovaly?

The theme of survival forms a major portion of the book. The author was one of about 10,000 people believed to have survived incarceration in the Lodz ghetto. She and Rudolf Margolius were two survivors of Auschwitz and the Nazi holocaust. She survived prolonged periods of serious infection and illness. She survived years of being hazed by the Communist party and ostracized socially. She survived the execution of her first husband.