The Nazi Hunters by Andrew Nagorski

The Nazi Hunters by Andrew Nagorski is a work of nonfiction that covers the stories of Nazi hunters who in the decades after WWII sought to bring to justice people who committed war crimes on behalf of Germany.

It wasn't a coordinated effort to find and prosecute former Nazis, there were different people trying to do different things in different ways, not always agreeing with one another. Some people wanted to simply move on after the war, and focus on things like the threat from the Soviet Union, but others kept in the public eye the effort to locate, identify, and prosecute or remove from positions of power former Nazis. 

Nazi hunters like Fritz Bauer, Eli Rosenbaum, Beate and Serge Karlsfeld, Simon Wiesenthal, and the Mossad agents who captured Adolf Eichmann in South America in 1960 and brought him back to Israel for trial didn't want to just forget the past. 

Justice wasn't attainable given the atrocities committed, but people should remember what Hitler attempted to do, and almost succeeded at. The horrific nature of the crimes should never be marginalized or forgotten so books like this are important.