SAS Major Harry Maxim is assigned as a bodyguard for a nuclear strategist attending a conference.
A dying man writes a letter to a senior civil servant who commits suicide. SAS Major Harry Maxim is seconded to security at No 10. One of his tasks — to look after nuclear strategist Professor John Tyler. A Czech defector with information worth killing for — is there a connection?
The Czech defector starts a 'mole' hunt. The KGB are interested in the missing letter. Charley Farthing wants his day in court to denounce Professor Tyler, and Harry Maxim has a hard time with them all.
In France, Agnes and Maxim meet the other surviving member of the group in the photograph. In Luxembourg, Professor Tyler arrives for the European Conference — while Harbinger manipulates and Harry discovers there are no rules in their business.
Charles Dance
SAS Major Harry Maxim
Dan O'Herlihy
Professor John Tyler
Alexander Reid
Chris Maxim
Jill Meager
Agnes Algar
Julian Curry
Sir Anthony Sladen
Harvey Ashby
George Harbinger
Harry Jones
Charley Farthing
Constantine Gregory
Komoscin
George Howell
DC Phillips
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