This book is packed with details of ancient history from many peoples in the Caucasus region, not just about the Khazars, and you will be as surprised as I was to learn of these many hidden details of these peoples. If you enjoy history, this is the book to get. The only downside of this book is that it is advertised as being 318 pages and the paperback edition I was sent was only 255 pages. There seems to be 63 pages missing. I don't know if this will have any bearing on the message Koestler wanted to convey or not, but I wanted everyone to be aware of this discrepancy. Overall, it was still well worth getting from the information it contained and I believe, from other sources that I also know of, that Koestler proves his thesis of the Khazars NOT being ethnic Jews, since even their own King Joseph gives a detailed linage proving heritage back to JAPETH, NOT Abraham, and scholars have verified the authenticity of this record. We all have our own particular "beliefs" that we can justify to not believe what Koestler states in this book but it's kind of hard to argue with facts. As Benjamin Disraeli once said: "There are lies, damned lies, and statistics" and this book is loaded with statistics that can't be argued with nor refuted, just ignored or not believed!!! Get the book get educated, and you decide the Truth of what is presented.