Mr. and Ms. Guinness' massive biographical study of their family is tremendously interesting to any devoted reader of the Mitfords. However, their attempts to rehabilitate the legacy of unrepentant fascists Diana (Guinesses' mother--so it's an understandable lapse) and Unity are nearly comical in their reach. They go to great lengths to discredit those who've criticized Unity and Diana's reprehensible involvement in and enthusiasm for Hitler and his British minions, including of course Diana's husband, Mosley; rather than adequately contextualize Diana and Unit's fervor, these attempts serve only to make themselves appear as familial apologists. The authors' unstinting criticism of Jessica's Communism brings their blind spots when it comes to Unity and Diana's fascism into particular relief.
As scholars, the father-and-daughter biographers are lacking in appropriate perspective and historical context; however, the "insider" information they impart makes the book a veritable treasure chest of Mitfordiana.