I am assuming they mean the UK home front, this being a UK challenge thing. But I am going to have to mention my Dutch favorite first.
Oorlogswinter (Wartime Winter) is one of those kid's books you never, ever forget. This is the story of a 15 year old boy in Nazi occupied Holland who finds a wounded English fighter pilot and has to figure out what to do with him.
If we're talking UK homefront, I am going with All Clear. Time travel for the win!