The best part about the book was the first half where the author, a professional psychologist and a holocaust survivor, who has experienced literally the worst human genocide in the history of mankind, talks about how the mind of an ordinary man functions when everything is taken away from him and he lives the less than bare minimum life. The author does not delve into the horrific things that happened in the Nazi camps and instead sticks to the theme of the book. He explains how one needs a strong future purpose in life to keep up the hope and struggle for survival. Without hope even your body gives up biologically.
The book would have the been great if the author had elaborated and explained the first half more in depth. But despite that definitely a must read.