Detective Superintendent Tony Clark is an ambitious member of the Complaints Investigation Bureau, an internal organisation that investigates claims of corruption inside the police in England and Wales. Along the way Clark overcomes strong influence from his superiors and problems in his private life, most notably the break-up of his marriage following an affair with WPC Jenny Dean.

• Siobhan Redmond
• Tom Georgeson
• Neil Pearson
• Tony Doyle
• Dorian Healy
• Nigel Lindsay
• Sylvestra Le Touzel
• Robin McCallum