|  | 
|  |  | 
|  |  | 
|  |  | Cast |  |  |  |  |  | Deputy Chief Constable John Stalker | SHEPHERD, Jack |  | Det. Chief Supt John Thorburn | CALDER, David |  | Det. Chief Insp John Simons | RYAN, John |  | Det. Sgt Eileen Scarrett | CUNLIFFE, Jane |  | Chief Con Sir John Hermon | McKENNA, T.P. |  | Asst Chief Con Trevor Forbes | McELHINNEY, Ian |  | Det. Supt Thomas George Anderson | MAGUIRE, Oliver |  | Det. Chief Insp Samuel George Flanagan | SHANE, George |  | detective inspector | DRURY, Patrick |  | Con. John Robinson | HAWLEY, Richard |  | Con. David Brannigan | WHELAN, Gary |  | Sergeant X | HARRIS, Aaron |  | Constable X | O'MALLEY, Daragh |  | Constable Z | HOLLAND, Dick |  | MI5 officer | CELLIER, Peter |  | Michael Tighe | BIRCH, Barry |  | Martin McCauley | McKENNA, Breffni |  | director of public prosecutions | GREENE, James |  | HM insp of constabulary for the North West | MATHEWS, Tony |  | Mr Tighe | LAMB, Peadar |  | IRA informant | RIMKUS, Stevan |  | Professor Marshall | HAWTHORNE, Denys |  |  |  | Credits |  |  |  |  |  | Director | KOSMINSKY, Peter |  | Production Company | Zenith Productions |  | Sponsor | Yorkshire Television |  | Producer | STAFFORD-CLARK, Nigel |  | Executive Producer | RICHARDSON, Keith |  | Production Manager | LOVER, Peter |  | By | EATON, Michael |  |  | Photography | PYRAH, Alan |  | Editor | ASPINALL, David |  | Production Designer | LONG, Mike |  | Art Director | HALL, Agnes |  |  | Music | PORTMAN, Rachel |  |  |  |  |  |  |  |  |