Although an abundance of letters and other material on and from Felice della Rovere has survived, I found this book oddly unengaging. It does not help to get you involved in the story that the mjority of the chapters is not longer than 3-4 pages.
The majority of the content deals at lenght with the fact that Felice ran her household and investments independently of her husband or family in an era in which that was highly unusual. Thrilling at that may have been at the time, it did not make the book really "unputdownable" to me. I found this book in a way very informative, but hardly enthralling.