Detective Superintendent Lorimer’s worst nightmare is a serial killer loose in his city. But two serial killers operating on the streets of Glasgow is a nightmare come to life. Is there a link between the brutal slaying of prostitues in the backstreets of the city and the methodical killing of several unconnected businessmen? Lorimer is never one to jump to conclusions but something about these cases just doesn’t add up. Psychologist Solly Brightman is helping with both cases, but someone within Lorimer’s team is sabotaging their efforts by leaking confidential information. As a freezing winter grips Glasgow, two killers are brandishing their own kind of brutal justice, each taking greater risks and claiming more victims. For Lorimer, time is running out.