Book excerpt: Luke Delaney takes the thriller genre to new heights with his debut crime novel, Cold Killing—an unforgettable and haunting duel between a seasoned detective and a brilliant serial killer. Detective Inspector Sean Corrigan finds the body of a brutally murdered young man in his own South London flat. Corrigan takes the case and soon finds himself embroiled in a deadly cat-and-mouse game with a ruthless and clever serial killer who changes his modus operandi each time he kills, leaving no useable forensic evidence behind... Former London murder squad detective Luke Delaney has created a cast of memorable and complex characters in this dark and psychological page-turner.