When one of Regan's snouts complains that his girlfriend's recent suicide was murder, the flying squad detective feels compelled to investigate. He uncovers a conspiracy that reaches the heart of the government, and finds himself fitted up, suspended and under the scrutiny of Special Branch.

• Euston Films
• John Thaw
• Dennis Waterman
• Barry Foster
• Ian Bannen
• Colin Welland
• Diane Keen
• Lynda Bellingham
• Brian Glover