A great book. It lets you see the European History of the XVII-XIX centuries in a different light.
It's not a speedy reading, the text is dense. I read a chapter per week and it was a right amount of information.
You get a history of crime, of police and its acceptation and corruption in different countries, their balance with the personal liberties, the great judicial errors, the detectives and the famous criminals, the most notable crimes.
An ample casuistic and good commentaries, sometimes biaised according to some dated concepts.
But all in all, you see that the crime detection, even with the DNA, didn't evolute as grandly as they say, while the public freedom has greatly suffered.