While I have a list of complaints about this book, I cannot wholly condemn it. If you are looking for an introductory history to the Tudor dynasty, it's not a bad place to start. It will leave you hungry for more in depth histories of each monarch (king or queen).
First off, I have to say that the book desperately needs another editorial review. The text is heavily sprinkled with missing commas, periods, misspellings, and in the chapter about Catherine of Aragon, on one page the author calls her sister Joanna and on the next page Juana. These are errors that absolutely should not be present in a $30 book.
Secondly, it feels as if the author wrote under too many constraints. This is only a 234 page book that spans roughly 200 years. Surely there could have been room for elaboration. I also felt the author was limited by focusing only on the queen in each chapter. This leaves much to be desired in the chapters on Catherine de Valois, Margaret of Anjou, Elizabeth Woodville, and Elizabeth of York if you are not already familiar with their contextual history.
I also feel that the author inserted one too many editorial comments about his subjects. It just plants a little seed of doubt - how much do I trust this author?
Finally, while portraits of the queens are nice to look at, it would have actually been helpful to have a family tree to reference. You will also want dictionaries by your side, both Latin and English. Is it just me or do authors seem pretentious when they use non-English phrases without translating them?
My recommendation: wait for the paperback. Hopefully by then, the publishers will have fired whoever edited this book.