Bill James 
Naked at the Window [EPUB ebook] 

Drug dealer Ralph Ember stumbles on a ghastly surprise when he and sidekick Beau Derek arrive at the house of yachtsman Barney Coss, his bulk supplier. Barney and his two women have been savagely murdered and the murderers, three drug rivals from London, are still in the house. Beau dies quickly at their hands, and although they let Ralph go, he’s a marked man. But when Melanie, Beau’s alluring, ruthless widow, learns what has happened, she is bent on revenge and wants Ralph as her partner all the way. 'Bill James is a frontrunner among those who have turned the police procedural on its head’ Sunday Times