Detective Inspector Lorimer's worst nightmare is a serial killer loose in his city. But two serial killers operating at once in Glasgow is a nightmare come to life. Is there any link between the brutal slaying of prostitutes in the backstreets of the city and the methodical killing of several unconnected businessmen? As the freezing winter grips Glasgow, two killers are relentlessly taking lives in cold blood. For Lorimer, time is running out.