The team are confused by a chain of events that involves lethal narcotics, a series of killings, and a drug addict.

Bodie and Doyle investigate the murder of a prostitute, and their only clues are a pornographic film and a Eastern bloc-backed plot to blackmail a prominent politician.

CI5 uncovers a plan to hold the home secretary hostage in order to demand the release of a dangerous prisoner.

CI5 become aware that an assassination plot on a group of visiting Greek Royals is being planned using a rifle that has a range of over two miles. But they must find out who is the gunman and what is his target - before it is too late.

Following the assassination of a senator, Bodie and Doyle are assigned to protect the witnesses after a newspaper publishes their names. But the task soon gets out of hand.

David Suchet and Geoffrey Palmer guest star. The team form a line of defense against groups of mercenaries and guerrillas waging war on the streets of Britain.