A police computer expert is seconded to Belfast to track down the identity of an IRA mole.
Eamon BolandFreddie Ross
Tony DoyleDonal McCarthy
Sean CaffreyChief Inspector Daisy Burke
Des McAleerDermot Shea
Denys HawthorneDaniel KentJames DonnellyThomas Mallin
Alan DevlinEamon Duffy
Emer GillespieClare Barrett
Hilary ReynoldsMaureen BarrettJohn KeeganSean Scanlon
Robert BlytheAsst. Chief Con. GilbertChristopher WhitehouseFrank GallagherJoseph CrillyDominicTom PriceDugganVirginia ColeMrs Duffy