If there were to be more books for 2020 mentioned, these two would be the ones:
Michael’s book is definitely not fiction, though, as it’s about his search to find out what happened to a couple of his father’s uncles in WWII. It is the most touching of tales.
And Tom, well, maybe his book is fiction, but being based on the real stories of children rescued after WWII and brought to Britain, his book reads more like non-fiction as well.
As you can see, they have the war in common, as does Elizabeth Wein’s The Enigma Game. So that’s three out of four. The war really does continue to have much influence over what we read.