(Although broadcast as the final episode of the series, "Sleeping Dogs" is chronologically set following the events of "The Wolves are Coming" - the 1993 pilot episode with Derek Jacobi.)

Neil is asked to meet with retired KGB officer Alexander Petrov (Leo McKern), who has approached the service claiming that he has highly classified information that he wishes to sell on to pay for a triple heart bypass.

(Plot spoilers from here)

Petrov refuses to give in easily, but provides Neil with the names of two sleeper agents, Annie Shepherd (Frances Barber) and Bill Roper (Bill Armstrong) as an 'introductory offer'.

But while Neil sets about tracking down Shepherd and Roper, Petrov is murdered after suffering a heart attack whilst being tortured, and Roper is later found dead having suffered a broken neck.

Whilst trying to protect Annie, Neil finds he has become the target of a German hitman, Hans Schroder (Nicholas Jones), who believes him to have been responsible for Petrov's death. With Schroder's help, Neil's investigation leads him to uncover that two rogue members of the IRA are trying to recruit members of Petrov's former cell to carry out a targeted attack on a summit being attended by Ministers of the Soviet.

First broadcast 23rd December 1996.

Cast:

Dennis Waterman as John Neil
Susan Jameson as Controller
Leo McKern as Alexander Petrov
Frances Barber as Annie Shepherd
Paul Freeman as Armitage
Nicholas Jones as Schroeder
Bill Armstrong as Bill Roper
Lalor Roddy as Mark Grady
Ian Fitzgibbon as Tony Lynch
James Aubrey as George Grant

IMDB page for full cast and other contributors:

https://www.imdb.com/title/tt1003266/...