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.

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.

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.

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.

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.

The body of a young girl is found floating in the Thames - is it murder, suicide or something worse?

A deranged man has taken a hostage and threatens to blow up a block of flats. Craven must act quickly to avert disaster.

Craven finds himself investigating a man accused of being a traitor, but has his doubts as to the truthfulness of the accusations.