This book is about what has been learned from genealogical studies of Jews using genetic data. The author appears to be one of the main researchers in the field and it is published by Yale University Press -- although it is geared towards layman.

The most astounding findings are the ones that have already gotten the most attention -- the fact the "Kohen's" or Jewish priests are disproportionately descended from one man about 3,000 years ago and that the African Lemda really are related to Jews. But they get more attention in this book along with more detail of how exactly the research was performed -- some of which led me to think that a lot of this research is still in a relatively primitive stage with more room for judgment than I would have expected.

The book also covers some other topics, including the link between genetic diseases like Tay Sachs and intelligence, bringing considerable skepticism to evolutionary explanations of Jewish intelligence by Cochran and his co-authors.

Ultimately, however, much of what one would want to know is simply not accessible to the genetic analysis we can do today -- and may not every be accessible. So while I look forward to the sequel with new discoveries and insights ten or twenty years from now, genes will still leave a maddening number of mysteries.