Michael Gilbert has written an amazing amount of novels in a career spanning over 50 years. I know him primarily through his well plotted espionage books. This one, however, is a very traditional British police procedural starring his Detective Sergeant Petrella.
Its a fairly good read but you can tell that it's an early career novel in that the plot is extremely tidy. I enjoyed his use of cutting edge technologies like fingerprinting and the aqualung.