Peter Fonagy's new book begins with a statement of his interest and allegiance to the “two cultures of psychology”: psychoanalysis, which emphasizes meaning in its attempt to understand experience and therapeutic change, and academic experimental psychology, which emphasizes reliable, measurable observation. He acknowledges that “there is bad blood between psychoanalysis and attachment theory.” To counter this mutual suspicion, he advances the thesis that attachment theory has a foot in both cultures, the world of meaning and the world of measurement, and so is ideally suited to encourage and show the way to a rapprochement of psychoanalysis with experimental psychology. Although the book is addressed to members of both cultures, it provides far more background and preliminary explanation of attachment theory for psychoanalysts than vice versa. Further, it quickly becomes evident that Fonagy recognizes that simple and universally agreed-on