Something a bit different here. The ever growing series of My Story books published by Scholastic. These are relatively quick reads with several for just about every topic covered by schools in history topics. They are written in the first person, often in a diary format and are a combination of a good story and a fun way to cover some of the key facts of the period the book is set. I have read Sophie's Secret War, Blitz, D-Day and Berlin Olympics, all great at discussing World War 2 and The Nazis.
Look out for bargain box sets of these books if you are looking to buy them.
The scholastic website gives more details... but look at Amazon and the Book People website for bargain boxes!!