by Tony Hoare
[Starring] Frank Windsor as Det Chief Supt Watt, John Franklyn-Robbins as Det Supt Adler, Norman Bowler as Det Chief Insp Hawkins, David Lloyd Meredith as Det-Sgt Evans, Grahame Mallard as PC Nesbitt
Watt and the Task Force investigate an 'accident', and enquiries take them behind prison walls.