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.

A long-distance lorry driver; a spaceman; a volunteer under reduced environmental conditions; a man in solitary confinement: the discomfort of these people is shared by Doran - when he can't put his finger on the panic button.

Jack Regan, an unethical officer of the Flying Squad, uses unorthodox methods to pursue criminals with the help of his partner, George Carter.