While other alternate-history "Nazis in Britain" stories exist (notably SS-GB) Against the Day is from a child's point of view. Young Frank Tate's father went missing during the 1940 invasion of the UK by the Nazis and now Frank spends his time dreaming of paying the Germans back. This book is equally fascinating for adults (indeed I would actually complain that the depiction of the British children is slightly unrealistic - they never seem to be afraid). While not focusing in too much detail on the horrors of war and the Holocaust, the novel nevertheless successfully explores a defeated and subjugated British mentality, something we have not experienced. Unless you count economic defeat of course....