Barker, a deranged, embittered old lag and his young accomplice Stacey - whom he disguises as a female hostage - dig in on a warehouse roof, pointing their machine-gun at a hospital ward and threatening to kill the patients unless they are given a million pounds. Bodie and ace climber Murphy scale a factory chimney to get height on them but almost scupper the operation. Doyle, however, after a visit to Stacey's girlfriend, has a better plan.
When a South American student, an apparent cocaine trafficker, is shot dead, Cowley takes his sister, Diana, into protective custody to discover who is organizing the racket. It turns out that Diana is working to destroy the ring and has powerful enemies in her government back home and a corrupt civil servant working with her country's ambassador. Bodie and Doyle must protect her in what is known as Operation Susie, a top secret operation.
Cowley is made an unusual proposition by Jack Stone, a notorious villain and hard man. Stone will cooperate with the law and give himself up in return for protection for his wife Chrissie and their children. His son Nick is the victim of a hit-and-run outside his school and it is apparent that Stone is the target of a vendetta. CI5's job is to find out who is behind it and why.
Mentally unstable Lieutenant-Colonel Peter Lawson escapes from an army psychiatric hospital. He is in possession of vital NATO secrets regarding the world's most toxic gas and it is vital he be located. Has he been abducted by Russian agents or is he merely on a deranged campaign of his own to restore 'Britishness' to his country? Bodie and Doyle are sent to find him - with explosive results.
Doyle is shot in his flat by an intruder and Cowley believes the connection lies with a terrorist group, two of whose members were blown up following a car chase by CI5. Whilst Doyle lies in a coma dreaming of surreal graveyard conversations with his boss, Cowley and Bodie piece together the events of the last few days to identify the person who pulled the trigger and prevent them from doing it again.
Acting independently of each other Doyle and Bodie pose as hitmen to infiltrate a mysterious group of assassins whose targets are all retired government officials. Bodie's hit, Liz Walsh, an old colleague of Cowley, colludes in her supposed death for the publicity and helps Cowley work out who could possibly want to get rid of a group of apparently insignificant people. MI6 interference also hampers the operation until Liz exposes a possible traitor.