The problem with this book is the problem I have with a lot of books set in the past. Too much factual inaccuracy. The author thanks many people at the end of the book, but I have to ask if any of them actually read the manuscript. Here's a few things I caught: the Duke of Windsor was governor of the Bahamas, not Bermuda. Princess Elizabeth was born April 21, 1926 and Princess Margaret was born August 21, 1930, so the author has wrong their age difference. They were Royal Highnesses, and it would have been improper to refer to them as "Your Highness" (without the "Royal"), and the distinction was considered important. Queen Elizabeth (George VI's consort) would not have called a titled man "your lordship." That's what servants call people with titles. A bathroom is where people go to take a bath. A toilet is where people go to relieve themselves. Princess Elizabeth would not have said she was going to the "bathroom" unless she wanted to bathe. I lived in a university city in England in the late 1980s, and everything, except the off licence, was closed on Sunday. I find it hard to believe so many shops would be open in Windsor on a Sunday afternoon when Maggie goes to meet her contact, especially during the war.
I know it's really hard to write a book, and I congratulate the author on her accomplishment. But PLEASE, in the future have a proofreader capable of finding the mistakes in the little things that drive crazy an Anglophile history buff like me.