It's a very interesting book, even though it did not contain that much new information for me. It might be knew information for Harry Potter fans who don't know anything about intelligence services and their methods, but I've already read several books about that subject, and this book stays very much at the surface of the available information. Also, the writing style is sometimes very annoying. And now a word about annoying: annoying! Once is funny, once every chapter is annoying. Still, the book dealt with two of my favorite subjects, Harry Potter and spycraft, so this book gets 4 stars.