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.
When 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 nightmare situation for Insp. 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 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.
An attractive Russian ballerina from a visiting ballet company goes missing. Jordan has doubts about the report's authenticity, buy Inman goes out on a limb to champion the girl's cause - with disastrous results.
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.