This book answers two fundamental questions about the Holocaust. How, and why, did it happen? Laurence Rees' masterpiece is revealing in three ways. First, it is based not only on the latest academic research, but also on 25 years of interviewing survivors and perpetrators, often at the sites of the events, many of whom have never had their words published before. Second, the book is not just about the Jews - the Nazis would have murdered many more non-Jews had they won the war - and not just about Germans. Third, as Rees shows, there was no single 'decision' to start the Holocaust - there was a series of escalations, most often when the Nazi leadership interacted with their grassroots supporters. Through a chronological narrative, featuring the latest historical research and compelling eyewitness testimony, this is the story of the worst crime in history.