Breach by W.L. Goodwater is a novel taking place in the aftermath of World War II, where the remaining powers fight with magic as well as conventional means.
Hitler’s Ashes: How Hitler’s Assassination Leads to the Development of Germany’s Atomic Bomb by John T. Cox is a very imaginative alternative history story. The premise, Operation Valkyrie (the plot to assassinate Hitler) has succeeded and Colonel Claus von Stauffenberg is the new leader of Germany.
I enjoyed this book very much, short but tells a great alternative history of what happened to Eva Braun. It could easily be a book just about that subject