Late one night in the snow, four students stumble upon the body of a dead girl. Twenty-five years later the police mount a "cold case" review of the unsolved killing, giving the friends an opportunity to clear their names once and for all. That is, until one of them dies in a suspicious house fire, and another in a burglary gone bad. It seems someone is still pursuing their own brand of justice. If the remaining two are to avoid becoming the next victim, they need to find out for themselves what really happened back there, in the snow. By Val McDermid, dramatised by Bert Coules.