The fact that this is the first book I've read on this subject makes it a difficult book for me to review as I have no comparisons. The two major thoughts on the book I was left with were: (1) this is a subject that is considerably more complex than I had previously thought; (2) the quality of material covered is well structured, comprehensive and authoritative. It's highly probable that for a high proportion of DNA testers the depth of material here would not be of interest and might well be largely incomprehensible (as some of it was to me). Its theme is the science and implications involved in the using of DNA as a tool for the family historian. There is no mistaking the fact that large scale commercially available DNA testing and databases have brought about a revolution in what can now be achieved when investigating our ancestry, possibilities that previously were inconceivable. Here, in this book, is an enlightened window on what is happening now in the field of DNA and what the future may hold. The book delivers a solid grounding in the subject. A reading of this book almost certainly won't answer all your questions on this subject but will leave you more informed and better equipped to pursue your objectives. And here is the key reason why questions may not be answered: each person comes at this subject with their own priorities and objectives. If it has a flaw, it is what I sense to be a common flaw of comprehension in this subject area, in that it could have given stronger emphasis to the fact, perhaps obvious, that our DNA is not something we individually own but is something shared with our close relatives. We cannot 'protect' our DNA alone, as we do not alone have possession of our DNA. All decisions about our DNA need to be considered collectively with close family as no action, and any potential consequences, can be deemed as isolated to any single person. This is touched upon in this book but could perhaps be more openly dealt with, the underlying message to everyone being each of us lacks the means to singlehandedly secure privacy and control of our DNA. There is a significant responsibility on each and everyone of us to be open and transparent in our actions when it comes to what we do with 'our' DNA.