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CI5, the British force formed by George Cowley to combat "anarchy, acts of terrorism and crimes against the public," has grown into an international force with agents from around the world.

A false FBI agent uses the agents of CI5 to locate a protected witness and kill him.

Palestinian leader Khadi is due in London for important and secret peace talks but his arrival has been leaked and a woman terrorist is shot whilst filming the talks' rehearsal. CI5 link up with ministerial secretary Frances Cottingham, who innocently leaked news of Khadi's visit to her boyfriend, who is not whom he says. Cowley gets her to give him false information but is he really the assassin?

Former agent Quinn escapes from Repton mental hospital and, after renting a room which he re-arranges to look like a cell, retrieves his gun from the woods. He has recalled the days when he was captured and brain-washed by the KGB into killing four of his colleagues. He shoots two of them, in one case fatally, before pursuing his next target - Cowley, who escapes protective custody to seek out Quinn and do a deal with him.

Years earlier spy Thomas Darby sold out and defected to the Russians. Now he has returned to England. Cowley is anxious to locate him and find out from him the names of other double agents. Men with guns are also after Darby - to silence him before he can pass on any information.

Cat burglar Sammy Layden gets in way out of his depth when he stumbles upon a smuggling ring connected to the Arab Embassy, for which he pays with his life. Bodie and Doyle become burglars, 'backtracking' on Sammy's movements to discover exactly what he found that was so deadly, whilst Doyle has to cope with the attentions of Marge Harper.

Amnesiac Gerda collapses in a church before giving Cowley a garbled message about an attack on a diplomatic meeting the next day. After the ambulance taking her to hospital is attacked she leads Doyle and Bodie to a Kentish village where she regains her memory, telling them that she is a nanny and that her employers were abducted by gunmen who plan to hi-jack the meeting. CI5 have to locate the family and their captors before the latter disrupt the talks the following day.

Bodie and Doyle are assigned a routine bodyguard operation for a 'Mr. X', Middle Eastern diplomat Hanish, but no sooner have they picked him up than they are pursued by gunmen who seem to know every move on his itinerary, rendering two safe houses anything but safe and forcing a final showdown on a houseboat.

Francisco Cabreras, teenage son of the president of the South American country of San Ibrez, is shot dead by members of a terrorist group opposed to his father whilst he is playing polo. Whilst CI5 get on the killers' trail after an eye-witness identifies their car, Doyle discovers that Anita, Francisco's feisty step-sister, is unknowingly dating one of the terrorists. She agrees to help in his capture before his gang claim another victim on a golf course.

On leave with a hand injury, Bodie is in the country with his girlfriend Julia when they run across the Meyer-Helmut terrorist group. Bodie captures a gang member but he and Julia are chased by the gang and take refuge in a vicarage, where the gang kill the vicar. It is down to Cowley and Doyle, travelling blind, to locate their colleague before there are any more casualties.

Charity worker Susan Grant is being terrorized by a masked stalker and, whilst the police are skeptical of her story, Cowley, who knew her father, believes her. Bodie is assigned to protect her and kills an intruder who breaks into her flat. Suspicion falls on her elderly work colleague Henry, an inveterate human rights campaigner, who keeps pictures of Susan in his flat. But what are his motives and how is he connected to the sinister gang who clearly want to hurt Susan?

Stefan Batak, a Bulgarian who has been spying for Britain, is released as part of an exchange of agents, and CI5 are charged with his safety as well as establishing whether his information is genuine. However, he is killed by a poison introduced into his bloodstream, and the Professionals must trace his killers as well as working out what part his daughter, concert pianist Anna, may have had in the death - if indeed she is his daughter.

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.

The death bed confession of a former MI6 head reveals that Suzie Carter, key witness in a major corruption trial a couple of decades earlier, did not commit suicide by jumping out of a window as imagined but was pushed - by the police officers who were supposed to protect her. The case is re-opened but the officers themselves are now being targeted by an assassin. Bodie and Doyle, with new young colleague Tony, must find out who is ordering the hits and why.

Bodie is delighted to re-encounter old flame Marikka Schuman, an East German film star, with whom he spends an idyllic time in his flat. However he is unaware that Marikka's husband and henchman Willis have set him up to take the rap for an assassination, causing him to go on the run from his CI5 colleagues. Although he is eventually cleared there is no happy ending for him with Marikka.

Israeli minister Asher Biebermann is kidnapped from outside the Festival Hall by two men known as Frank and John, whilst under police protection. He is taken to a house in a residential area where he chained to the bed. Acting on a tip-off, CI5 discover a photograph and a cassette tape in a telephone box and, using such information as they offer, locate the house, planning to break in from next door and rescue Biebermann.

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.

C15 are pursuing a German terrorist cell who, having thrown a CIA agent off a balcony, are planning a new operation. Doyle captures a female member but Bodie, posing as an arms merchant, has his cover blown and is taken hostage by the gang to exchange with her. As the two groups meet at the air-field for the trade-off, the gang tie fifteen pounds of explosives to him.

American senator John Jerry Patterson is assassinated in daylight in bogus roadworks in full view of other motorists. To flush out the killers Cowley prepares a newspaper story claiming that their faces have been recognised but the witnesses' identities are erroneously disclosed and two are murdered. Working with loose cannon operative Tommy, Bodie and Doyle must protect the others and identify the gang, in which they are helped by a witness who offers himself as bait.

Foreign diplomat Josef Merhart tips off villain Harry Walters that his embassy transports silver bullion to Tilbury docks and Walters arranges to have it hi-jacked. Mandy, the girl who introduced the two men, goes into hiding on Josef's advice but, as her flatmate Debbie is Doyle's girlfriend, CI5 are in a position to be suspicious and make the connection. Walters sends a gunman to kill Mandy so Doyle and Bodie must get to her first.

Whilst Doyle is on a date with Kathie Mason his flat is robbed and a powerful laser gun which he was given to test is stolen. After an attempt to kill him, he and Bodie make inquiries as to who would have stolen the gun and Maurice, one of their informants, is shot dead with it. Another colleague is taken prisoner as bait to flush Doyle out in the open by the thief, Preston, a disgraced ex-cop sent to prison on Doyle's evidence and now after revenge. But who knew Doyle's routine that well that he - or she - was able to tell Preston about the gun?

Chief Constable Green operates a zero tolerance policing system bordering on fascist dictatorship. When a gay youth counselling centre is attacked by masked men one of the staff suspects the police are behind it and goes to see Cowley. Bodie and Doyle themselves become victimized after being charged with a minor traffic offence. However Green and corrupt inspector Chives are about to find out that they have picked on the wrong people - especially as Doyle has photographic evidence of police corruption.

With Bodie having shot a suspected drug smuggler outside the flat of witness Ann Holly to save Doyle, Ray consoles her, and they become lovers, intending to marry. An informer tells Doyle and Bodie that 'the Christmas Man' is flying in a consignment of illegal drugs and, unfortunately for Doyle, it seems likely the 'Christmas Man' is Ann's father, who is put under surveillance. An enraged Doyle resigns. Will his indignant behaviour put the operation at risk and is Ann only an innocent bystander?

Colonel Sangster and his gang are smuggling art treasures and industrial secrets out of the country and selling them on to foreign powers. Tibbs, Sangster's pilot, uses a complicated method of getting the crates with the illegal cargo past customs by taking them out of the country having misdeclared them on paper-work and, having been recalled to rectify the mistake, substituting an innocent cargo which is passed by Customs. Doyle goes undercover to infiltrate the gang.

Working undercover as supposed hitmen out to fake the assassination of a government official, Bodie and Doyle's new partner turns out to be Jimmy Keller, who once saved Bodie's life when they were in the S.A.S. However, Bodie is concerned that Keller is in too deep with the gang of Italian terrorists whom they are shadowing. Is Keller just a maverick mercenary out to make money from both sides or a genuine danger to CI5?