It is beyond our imagination to even begin to comprehend the horrors of that time. There is another excellent book called The Hiding Place (available on Amazon). It describes a Dutch family's efforts to save Jews by hiding them in their attic. It is a very moving story and just horrifying to know that this really happened.

http://www.soon.org.uk/true_stories/holocaust.htm
This link actually provides a condensed version of the book.

My former boss was Jewish. His parents actually met in a concentration camp. They have been approached by many people and asked to tell their story in a book but they have refused. They said they just want to forget. I remember one day my boss was telling me that his daughter came in from playing and said she was starving and asked what was for dinner. Her grandfather told her right away "Don't ever speak like that. You have no idea what to starve really is."