Find Inspector West — John Creasey

To Roger West, the brutal death of an attractive girl with a bad reputation in a scruffy back room meant more than murder. He had to move fast, not just to find the killer, but to clear his name with a boss who didn't like his methods. So when he finds his chief suspect innocent and a plot riddled with blackmail and forgery, he is forced to act coldly and ruthlessly -- his way.