The daily lives of the men and women at Sun Hill Police Station as they fight crime on the streets of London. From bomb threats to armed robbery and drug raids to the routine demands of policing this ground-breaking series focuses as much on crime as it does on the personal lives of its characters.

When the British government orders the assassination of an Air Ministry official suspected of leaking top secret intel, their top assassin assigned to the job discovers there may be more to the hit than meets the eye.