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.

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