Maggie arrives to join the new unit on the day that Jenny, the third member, is killed while investigating a Russian trawler anchored in the estuary. While Fred avenges Jenny's death in a cat and mouse game with the Russians, Maggie makes a mess of her first assignment - a run of the mill adultery case.
A cat burglar breaks into a Special Branch 'safe house', where two illegal female immigrants are being held for questioning. He helps one of the Women to escape and Maggie, on thetrail of the thief, has to track them both down.
A death on the motorway leads Maggie to a man on the run, in fear of his life, and to a plot involving forged bearer bonds.
A man's body is found floating in the river. Pru, investigating the mysterious death, finds that an official "block" has been put on the case. Despite this, she exposes a secret deal to build a new CIA listening post in London, and obtains justice for some defrauded investors in exchange for keeping her mouth shut.
An old Woman tells 'EYES' she has just seen her husband, who was supposed to have perished when a submarine sank nearly forty years ago. Maggie's investigation reveals that the submarine was carrying gold and that the crew mutinied, killing the officers and disappearing with the loot. The murderers, now in their seventies, are willing to kill again to protect themselves.
A clairvoyant asks Pru to find the location of a "vision" - a place where she is convinced she is going to die. Pru discovers that several other dangerous individuals are also searching for it, and that there is a real pot of gold at the end of the rainbow.
Fred is in the office at night, guarding a valuable jewel for a rich client. Keeping her company is her latest 'date' - an attractive young man who works for the client. The jewel turns out to be a red herring, and before the night is over, Fred begins to doubt her sanity.
Fred, acting as 'best man' at a friend's registry office wedding, stumbles on a marriage racket run by an unscrupulous organisation for Asian girls wanting EEC citizenship. She falls for a Dutch boy used by the organisation, and is devestated when the investigation ends in his murder.
A hit man is sent from a newly independant African country to kill Pru's father who had incurred the enmity of the President whilst serving in the British army there. The retired General refuses protection and Pru is sent to guard him. Her father thus learns for the first time of her real job. Meanwhile, Maggie acting for an insurance company, exposes a chair-ridden accident victim as a fraud.
A self-made entrepreneur asks 'EYES' to follow an ex-con with whom his young daughter has become involved. Fred unmasks a blackmail sideline run by the entrepreneur's second in command, based on client's personal information fed into the organisation's central computer.
Pru is asked to investigate the theft of an old Debussy manuscript from an exclusive piano emporium. The thief turns out to be an attractive young music buff - a member of a family of thieves who are not all as harmless as he is.
When Mrs. Driscoll asks the 'EYES' operatives to follow her husband, it seems a perfectly straight forward assignment. It turns out to be the most perilous case they have ever handled, leading Maggie into deep waters, where a ruthless and terrifying adversary lurks.....
Edward Stone, a Soviet spy serving a life sentence in a top security jail, makes a daredevil escape by posing as an army officer in a jeep. Beth, Stone's illegitimate daughter, is kidnapped by Stone's accomplices - she is unaware of her father's identity. Awaiting his escape to Russia, Stone insists on phoning his estranged wife to arrange a meeting. Tension mounts as Maggie's life is endangered, Stone tries to effect his escape to Russia and persuade Beth to accompany him, and a Home Office contact, O'Donahue's. true allegiance is revealed.
When Shirley (an undercover agent) is killed in some lonley woodland, Fred and Tessa investigate posing as 'travellers' and join a band of nomadic religious freaks camping rough on Lord Leydon's estate. Tessa goes to Manor House to visit the impoverished James Leydon who already suspects her of working with the 'thought police'. A 'friend' of Jamie's, Barbara Dalchley, turns out to be in league with Sergei, a Russian defector, and Seth, one of the 'travellers' whose mission is to take pictures of nuclear missile bases. A security patrol around the estate rescue Fred and Tessa when their camper van is sabotaged, and the episode ends with Tessa involved in a shoot-out.
When an Arab prince and a group of foreign associates with Mafia connections are gunned down on a country estate, the 'EYES' team uncover a drug racket fronted by an international casino consortium. The Triads take exception to the Mafia trying to take a slice of their action and innocent and guilty alike fall by the wayside.
When Sara John's, the daughter of a Russian defector is threatened by a Soviet agent while on a school trip, the 'EYES' team is alerted, and warning bells ring in Whitechapel where one employee shows a more than passing interest in their case. Fred and Tessa go undercover, posing as a groundsman and games mistress respectively, to protect the young schoolgirl while Maggie discovers that Sara's estranged parents are desperately close to revealing a major spy scandal, putting their daughter's life at risk.
When a young schoolboy is abducted by a terrorist group, the C.A.T.S.EYES team discover that Simon Maxstead's father has access to some top secret government information for which the boy is being held to ransom. Nigel orders the case 'top priority' and Maggie, Tessa and Fred uncover a major international terrorist ring from Bangladesh posing behind a front of an innocent grocery shop.
Jailed in South Africa for bank robbery, Ben Hutchins is released to custody in England as he is supposedly dying of cancer. On arrival, he tries unsuccessfully to escape from his "escort", Kerber, and evade Maggie and Nigel. Further checking by the 'EYES' team reveals that Hutchins health is, in fact, alright but Kerber, a well-known assassin has his own plans for a funeral at which four prominent black African leaders will be present.
A drug racket, using a refrigerated trucking company, Coldburn, for cover, is exposed when Chas' lorry is attacked and he turns to Fred and the 'EYES' team for help and protection. When Chas is kidnapped and required to 'talk' by the Coldburn men, his silence is punished by being locked in the deep freeze. The 'EYES' team arrive in the nick of time to save Chas from a chilly ending and a top ranking drug squad commander is exposed.
During an army training stint for the C.A.T.S.EYES team, Sir Jack Fenn tells Maggie that they are holding a top Czech spy, Kessler, for debriefing. On investigating the other recruits, she discovers that a number of them do not 'check out', and Fenn suspects that the KGB want Kessler - dead or alive. Events take on an unexpected turn when a kidnap and subsequent murder attempt on Kessler are foiled by the team, and Fenn also has something to hide.
Yuri Yevgenev, a Russian secret agent, lands up in the local police station after being set up by Maggie and the Special Branch boys. In the ensuing KGB attempts to have Yuri returned, Maggie's life is threatened, and Tessa and Fred discover that a Home Office secretary supplied information leading to Maggie's capture. Fred and Tessa effect a dramatic rescue and save Maggie from impending torture.
Following a car bomb, the C.A.T.S.EYES team's police contact Roddy is seriously injured, and the team are accused of negligence. Maggie feels responsible and after a period of erratic behaviour, she collapses and is diagnosed as being mentally exhausted. During convalescence, her memory starts to return, and then the truth drug is administered, her recollections reveal unexpected double dealing.
When two ex-pow's think they recognise a frighteningly familiar face on the front page of a newspaper, they call in the C.A.T.S.EYES team to investigate. Tessa goes undercover as the chauffeuse to a junior Government Minister with bizarre tastes which lead the team on a calamity course to danger.
What's the link between the murder of a stripper in a Middle East nightclub, and Jethro Blackstock, who runs a talent agency and lives in luxury on the South coast? The 'EYES' team investigate a number of cases of arms going missing from local military establishments, and Tessa gets a job as a barmaid in a seedy pub, to find out more. Maggie meets an 'old flame', Derek Moore, who warns her of the dangers involved with Blackstock. The girls remain convinced he is connected with the arms smuggling.....
Fred is visiting Amsterdam for a few days break when she recognises an old schoolfriend working with a film crew who are making a commercial. Later in a Dutch disco, Fred meets up with Sara Fields and they remember the old days. Flying back home, Sara is caught smuggling drugs through customs and is arrested. Convinced her friend is innocent, Fred puts her own life on the line to prove it but was it worth it?
Tessa visits her alcoholic mother in the country for the weekend, accompanied by Fred. Their break is interrupted when three men arrive and hold them all hostage, and the relaxing weekend does not turn out the way anyone expects.
The discovery of electronic listening 'bugs' on some valuable antiques stolen from a country house, leads Maggie, Fred and Tessa into the world of espionage and petty crime. The bugs are 'foreign' in design, but why should they have been placed in the home of jailed forger Joe McCrewer?
Ship designer Alan Moss' house burns down and all his work on revolutionary design concept for warships is destroyed. His plans had previously been rejected by the Admiralty and he was successfully going it alone until the fire. The 'EYES' team join Moss on a sailing trip which goes wrong when the rudder breaks, but they manage to get safely back to shore. An explosion at Maggie's flat seems like another attempt to kill Moss and Maggie goes to the Admiralty where she meets Commander Hutchins, a supporter of Moss' designs.
Following an annual luch with close friend Sir Edward John - who recruited Nigel - the 'EYES' team investigate Sir Edward's son Howard, a civil servant with access to secrets, who is reportedly acting strange. Maggie gets to know the Howard family when she goes to Sir Edward's 70th birthday party with Nigel. After Howard fails in a suicide bid, Maggie discovers Sir Edward's 'secret' and the reason for Howard's behaviour.
Pressed into taking a fortnight's holiday, Maggie looks up an old schoolfriend but within hours they both narrowly escape a hit and run driver. Then while visiting a stately home, tumbling scaffolding seems like another deliberate attempt on Maggie's life. So, when her friend Penny is shot, a guilty Maggie is determined to find out who is responsible an uncovers some disturbing revelations.