This book, unfortunately, seemed to take me forever to get through. I've read a good amount of history books on the Tudors (and just history in general) and this book just seemed lackluster. Rarely do we get to see letters referring to, from, or to the gray sisters though these letters are often talked about. Mary Grey is barely covered. It seems like Katherine Grey's sons are covered more than Mary Grey. Lots of info is repeated multiple times. You just don't get a good feel for the type of women the Grey sisters were. There is also very little opinion on the Grey sisters which is crucial for a history book that you are basing off less noted people. Still it is at least worth a read.