Robert Churchill almost single-handedly developed the science of forensic ballistics, tying a specific gun to a bullet fired from it.
This book, by Macdonald Hastings tells the story of Churchill's life and traces the advances in ballistics.
It formed the basis of a fascinating TV series in the 1960s, but are no doubt lost forever.
It is well-written by an author who understands the subject well and brings the subject to life.
If you have an interest in forensics or ballistics this is recommended as a very good read.