I daresay I've some interest in Kant's old idea of establishing international law and the means to enforce it. Books tangent to this subject are of interest. The most readily accessible ones seem to be about Nazi war crimes and their occasional punishments.
The general tenor of this particular book is that a great number of persons, some of them victims or relatives of victims, have devoted a great amount of time and effort to seeking justice against the Axis perpetrators of violence against civilians before and during WWII. Often, very often, these aggrieved individuals have had to do it alone, their own governments being unhelpful or, in far too many cases, obstructive.
It's depressing but true that the USA, like some other allied states and, notably so far as protection went, the Vatican, pursued a policy of selective punishment, incarcerating or killing some war criminals, protecting and even hiring others. The Cold War and the post-war status of Germany was responsible for some of this behavior. If we didn't get their espionage professionals, rocket scientists and concentration camp medical experts, the Soviets might have. If we didn't get the popular support of the German people, the Soviets might have gotten Germany.
Despite the depressing history of governmental indifference to ethics when matters of high policy, or the cover-up of such, are concerned, the authors still manage to convey a sense of some hope in the stories of some very ordinary persons seeking and occasionally obtaining justice in the face of the powers and principalities of this world.