Inspector John Madden, like so many of his generation, came back from the Great War a changed man. When a par­tic­u­lar­ly savage and senseless murder takes place, he must persuade his superiors at Scotland Yard to adopt some new and unwelcome practices, such as psy­cho­log­i­cal profiling.

This well-done thriller is as much about the aftermath of World War I as it is a police procedural.