Tremendous book. If you are interested in reading more, I'd recommend the following:
Primo Levi: Survival in Auschwitz
Tadeusz Borowski: This Way to the Gas Ladies and Gentlemen
Imre Kertesz: Fateless
Victor Klemperer's diaries: I Will Bear Witness are also important books, but they are about surviving as a Jew in Germany (because he had an Aryan wife).
Anyway, all of those books are outstanding. They will certainly make you think.