I just finished a couple of books by Mark Felton.
"Guarding Hitler" is about Hitler's bodyguards and the security measures taken to protect him. it covers a numbers of failed attempts to get rid of Hitler. it is too bad that the guys trying to kill Hitler were either bad shots or not very good at bomb making.
"The Last Nazis" is about trying to find the Nazis responsible for the Holocaust at the end of the war. there were a number of groups that can take credit for them getting away. some of the Nazis are still alive and doing quite well. the allies , the catholic church and some other Nazi sympathizers , other governments all helped with them.
Mark Felton has a lot of videos on you tube that are very good to watch and can be addictive.
as a historian he ranks right up there with Richard Holmes
Mark Felton - Wikipedia