When a newspaper takes it upon themselves to irresponsibly publish a list of the names of witnesses to an assassination, it is left to CI5 to not only protect these people, but at the same time apprehend the killers before they strike again.

On leave from CI5 with a hand injury, Bodie takes a day trip with his girlfriend and finds himself face-to-face with the leader of a terrorist group. He captures him but then the rest of the gang arrive and trap Bodie and his girlfriend in a nearby vicarage, leaving him unable to alert his colleagues back at CI5 HQ. With barely any clues as to his whereabouts, Doyle and Cowley go on a chase through the countryside to try and locate Bodie.

Bodie is re-acquainted with a former girlfriend when she shows up in London, and during a secret meeting with her finds himself framed for an assassination and then ultimately on the run from his own colleagues at CI5.

Cowley is offered the name of a highly-placed double agent from an old colleague - who in return wants to be guaranteed protection with CI5. This leads to the start of a dangerous stand-off between the two, using Bodie and Doyle as the pawns.

Years after a man's wife died and his child left brain-damaged following a series of blunders at the hospital they were treated at, he returns to finally seek revenge by systematically assassinating each of the same hospital's medical staff one-by-one.

Cowley finds himself under suspicion when a former colleague of his is arrested for being a double agent. So just how deeply involved is the CI5 Chief?

CI5 discover that a possible terrorist attack is being planned, and the only clue they have in solving it is a German girl who is found collapsed in a church and suffering from amnesia.

A hitman is employed by a group of East German officials to assassinate a reporter who is planning to publish a report in which their new fighter plane is branded as a potential death-trap.

A post-operative ward in a hospital is held to ransom by a newly-released convict who plans to make a fortune, setting up his own foxhole at the top of a nearby building. CI5 hatch a plot to bring him down before he takes a fatal shot at the hospital.

Bodie is offered the opportunity to clear up all his gambling debts by a foreign diplomat - who in exchange wants to have some vital secrets from CI5.