I saw the trailer for this film a couple of weeks ago. Yesterday I decided to buy the book and try to read it, before the film came out. I did not expect to complete it within 24 hours, especially as I also did a day’s work and slept.
It is only 240 pages and because, almost the whole book is in letters with addresses as the top, they are not whole pages.
The book is set after the end of world war 2. During World war 2, Guernsey which is an Island between England and France was occupied by Germans. The letters reminisce about war years; which seems an odd would to use. Indeed the book does seem all very jolly, at first I thought this was odd given that in actual fact the times described must have been quite grim. Then I realised in letters like you do when posting on social media you present a more positive version than in real life. From what I have seen of the trailer it seems, the film will all be very jolly and I suspect they will have missed the opportunity to show the layers between, what is written and the reality.
The book was an easy read and I suspect the film will be easy watching.
Wonderwall 
I’m glad you decided to read the book and that you enjoyed it!
LikeLiked by 1 person