London Match concludes the story that began with Berlin Game, where Bernard Samson's wife Fiona was unmasked as a KGB double agent and was forced into defecting, and that was continued in Mexico Set, where Bernard Samson assisted the defection of Erich Stinnes, his KGB opposite number.

Samson suspects that there is a traitor within his department of MI6, due to the appearance of a memorandum which was leaked to the KGB.

It transpires that it is part of a plot conducted by his wife—now working for East German intelligence—to frame his superior, Bret Rensselaer, as a KGB agent.

Bernard Samson was played by Ian Holm and Fiona Samson by Mel Martin in a 1988 Granada Television adaptation of the first trilogy, entitled Game, Set and Match, transmitted as twelve 60 minute episodes.

[1] Filmed on location in Berlin and Mexico, the project included a large international cast with 3,000 extras and a budget of $8 million.