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.....