This was an interesting look into the American judicial system and the life of the man who created the framework how evidence could be evaluated and understood that is still used today. The narrative was slow to pick up, but I really enjoyed the author's use of excerpt from letters between Heinrich and his librarian best friend. His obsessive record keeping meant that this book was very detailed, which I also enjoyed. The author added some of her own opinion on the past and current state of the American judicial system, in terms of corruptness and lack of justice for the many people wrongfully convicted and jailed, that I think Heinrich would have agreed with.