@discountkart,
Some of my favorite authors in this genre include Sue Grafton, Raymond Chandler. Robert Parker, Scott Turow, Dashiel Hammet, Ngaio Marsh, others. Chandler, Hammet and Marsh, of course, are classics, nearly as venerated as A. Conan Doyle's Sherlock Holmes. The others are more modern. For police procedurals Joseph Wambaugh, ex-LA cop, can't be beat. There are a number of others that, for some reason, don't come to mind immediately.