John Cornelius (called JC) is a university don who also works for his city police force as a consultant psychologist. Samantha Valentine is his offbeat personal assistant and lover, while Inspector Cadogan is their police contact and Professor Owen Griffiths is Cornelius's head of department.

• Nicholas Clay
• Kim Thomson
• Stephen Yardley
• Jude Akuwudike
• Alan David
• Carole Boyd