The officers of the Special Branch mount a dawn raid on the homes of the members of a suspected spy ring.

Cowley suicides shortly after an unproductive round of questioning by Eden in gaol, which leads to an embarrassing public coroner's inquest. Jordon investigates a scientist being vetted for a sensitive position and all agree he's too far left for further consideration, yet he still succeeds.

A small boat arrives at a beach in Kent where illegal aliens are unloaded, but the police bag the smugglers and all bar one of the Pakistanis, now quite ill, who seeks refuge with an immigrant rights activist.

A teenager's vow of vengeance leads to Inspector Jordan interrupting a wedding and Superintendent Eden accepting a parcel that contains death. Before the day is over both men have cause for concern.

Informed that the manuscript of a Russian author's novel which has been smuggled into Britain is a forgery and could discredit the Goverment, Inspector Jordan goes against orders and investigates the claim.

The son of a trusted officer of the special branch has become radicalised while away at university, trying to join a gang of riot-minded militant socialist students. This threatens to break up his family, and his father's position.

A girl lands at Heathrow from Rhodesia, but owing to Britian's break of diplomatic relations, she has no valid passport. A young officer is supposed to mind her until she can be sent back, but takes her for a tour instead.

Is there something sinister going on behind the facade of 'The Children of Delight' - a group of hippies who have arrived on Eden's patch. Detective Sergeants Webb and Gifford go undercover to investigate.

Superintendent Eden is on the spot. The Security Commission has met to consider the leak that tipped a spy during the Troika affair. The detective is cleared - but told that he cannot continue his role as Special Branch controller.

A girl being held for giving official secret documents to the Russians faces a long gaol term, but an exchange offer for a Briton arrested in Moscow is offered. The officers suspect she's far more than she seems to be.

When a member of a foreign embassy is caught shoplifting in London, but tries to hide her status by willingly accepting arrest, Superintendent Inman takes an interest in her employers.

Jordan's methods cause friction in an overseas British Embassy when he goes to investigate the theft of ten thousand pounds.

When a KGB officer is sent to London to coordinate security measures with the SB team for the forthcoming visit a Russian VIP, Inman instructs Jordan to help him - with disastrous results.

Sent to investigate the death of the son of a pro-British oil sheikh in a bomb plot, Superintendent Inman finds a hotbed of intrigue and dangerous international situation about to explode in his face.

Jordan goes undercover as a prisoner to uncover a convicted spy's secrets.

Jordan flies to Frankfurt to escort a British subject, Selby, back to England. Selby had disappeared three years earlier in East Germany and the British Government are anxious to learn what he's been up to - but the Russian KGB hide in the shadows.

An ex-colonial policeman is pressured to return to Africa to testify at the trial of a onetime Mau-Mau warlord, but he adamantly refuses.

What appeared to be a straightforward case - protecting the wife of a foreign VIP, who has entered a beauty competition in the cause of female emancipation for her own country - turns into a nightmare situation for DCI Jordan.

An accusation of theft against a highly respected Greek historian sets the Special Branch team a problem. Interpol have requested his extradition from England - but Inman isn't satisfied with the facts of the case.

Inman meets the CIA's new man in London. Jordan meets an old friend from Moscow. All perfectly legal - until the two are seen together at intervals and the Special Branch team become involved in international politics.

Is an eminent scientist, on lone to a top-secret research establishment, a security risk? That's the question facing Inman and his team. The research establishment is suddenly prone to 'leaks'. Has the man been got at?

While a member of the SB team keeps watch on Karl Peter's flat, Inman and his team scan though his charge sheet. They believe he will attempt to incite London dockworkers into taking industrial action against their employers.

When military security intercepts letter written to a lonely serviceman by his foreign 'penpal' Rita, which contain casual references to secret information, Supt Inman sends DS Jordan to investigate.

When a Czech au-pair goes missing in London and her father is one of the most powerful men the country, Inman and Jordan must find out what's happened to her. But their enquirers lead to a dead end.

When Inman discovers that "The Guardians" are taking a more-than-usual interest in a group of pro-germ-warfare people and finds that their leader is a pretty girl, he decides to send Jordan along to question her.

Jordan and Inman go in search of a missing Russian ballerina.

When Britain's top code and cypher breaker is forced to mingle with Communist players during a chess tournament, Inman goes along to keep an eye on him. Moxon, meanwhile, is playing a dangerous game of his own: the pawn being Jordan.