Very interesting premise and written with her normal brilliance and some amazing descriptions of life in the blitz. Still somehow less satisfying than her previous novels.
Not sure I liked the Scifi element in this book, quite apart from the fact that I have never gamed in my life, so that a lot of the book went way over my head. Hope he goes back to his normal genre for the next book.
I have always hated Hardyesqe-style coincidences - letters under door mats for instance. Also I have always felt that if any of his characters made the common sense decision they wouldn't get into the scrapes they do.