The author founded his well known literary agency and has written several biographies. However, Ms. Secrest the author of the book about Princess Margaret is well known and has made at least one outrageous claim about Margaret.
I read the blurbs about the book on the DM paywall article and they sensational and lurid. It sounds as if it's another book full of claims and dirt rather than a serious look at Andrew.



https://en.wikipedia.org/wiki/Andrew_Lownie