First broadcast 3rd January 1990.br br An environmentalist professor is mugged and later dies of a heart attack after an attack on campus just prior to a controversial debate.br br br John Thaw - Chief Inspector Morsebr Kevin Whately - Detective Sergeant Lewisbr Geoffrey Palmer - Matthew Copley-Barnesbr David Neal - Dr. Julian Dearbr Barbara Leigh-Hunt - Blanche Copley-Barnesbr Pearce Quigley - Mick McGovernbr Michael Attwell - Parsonsbr Cheryl Campbell - Sylvie Maxtonbr John Joyce - Mr. Graybr Ian Brimble - Phil Hopkirkbr Tom Wilkinson - Jake Normingtonbr Irene Richard - Imogen Garrettbr George Costigan - Ron Garrettbr Denys Hawthorne - Chief Superintendent Renniebr Sydnee Blake - Mrs.