An ex-British spy (Michael Caine) helps a U.S. diplomat's wife (Sean Young) and blows the lid off a deadly government cover-up.

Led by Kim Philby, Plan Aurora is a plan that breaches the top-secret Fourth Protocol and turns the fears that shaped it into a living nightmare. A crack Soviet agent, placed under cover in a quiet English country town, begins to assemble a nuclear bomb, whilst an MI5 agent attempts to prevent its detonation.

An awkward office drone becomes increasingly unhinged after a charismatic and confident look-alike takes a job at his workplace and seduces the woman he desires.