Following a skiing accident, journalist Sally Proctor is recuperating at her parents' rural Somerset home when she hears about a local man, Brian Jennings, who's been jailed for arson. His sister, convinced of his innocence, is campaigning for his release - and Sally decides to help her by conducting her own enquiries. As she starts to uncover serious discrepancies in the original investigation, Sally and her family are threatened by a series of increasingly menacing incidents. It soon becomes clear that someone will go to any lengths to stop her finding out the truth.