A remarkable story, carefully researched and well documented, paralleling the lives of two men, representing the oppressed and the oppressor. Their respective stories show how each came to be what they eventually were. It is frightening to see how easily a mass murderer is groomed, from being a fairly regular man to wielding such power over life and death. Then there is the other man, who escapes Nazi Germany, volunteers to fight for Britain then devotes his life to hunting Nazi perpetrators. A fascinating and surprisingly easy read. Well recommended.