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The Fourth Protocol is a novel written by Frederick Forsyth. In 1987 it was made into a movie starring Pierce Brosnan and Michael Caine.
Spoiler warning: Plot or ending details follow.
The plot centres on a supposed secret East-West set of clauses which made up a 1968 agreement to halt nuclear proliferation. The fourth of these clauses, or Fourth Protocol, is the only one remaining. The Chairman of the KGB plans to breach this protocol and destroy the NATO alliance by planting an agent (Brosnan) in England to assemble and detonate an atomic device. One of Britain's most astute spycatchers (Caine) discovers details of the plan and races against time to stop it.
The politics present in the book are not represented in the film, in which Kim Philby hatches a plan to topple the Conservative government and bring the unilaterlist Labour party (at the time) to power.