It's an impossible crime--a member of the Peculiar Crimes Unit killed inside a locked autopsy room populated only by the dead and to which only four PCU members had a key. And to make matters worse, the Unit has been shut down for a forced "vacation," leaving detectives Arthur Bryant and John May stuck in a van miles away in the Dartmoor countryside during a freak snowstorm on their way to a convention of psychics. Now, with Sergeant Janice Longbright in charge at headquarters, Bryant and May must crack the case by cell phone while trying to stop a second murder without freezing to death. For among the line of snowed-in vehicles, a killer is on the prowl, a beautiful woman is on the run from a man who seeks either redemption or another victim, and an innocent child is caught in the middle.