I was prepared to really like this book, and I did like it, but not as much as some other recent books. The premise is the question "what if a postmistress doesn't deliver a letter?" The time is World War II and the characters are three women and two men, all Americans, caught up in the first part of the war, before Pearl Harbor. The first part was interesting; the middle was tedious. I found myself saying, "get on with it. Why are are you delaying what you have to do? (about a character's hard decision, not the postmistress). Too much hand wringing not enough action. In the end, the outcome wasn't much about the postmistress and a decision not to deliver a letter.
Much of the novel deals with the problem of the Jews in WW II and how few people in the U.S. could see what was happening. Their plight is brought out very clearly through one of the characters. And the bombings of England in the early 1940s (the "Blitz") made me understand what a horrible thing it must have been. Good book, not great.