George Smiley comes out of retirement to investigate a defector's claim that a Soviet mole has penetrated the highest ranks of British intelligence. The plot unfolds as a careful, methodical inquiry that peels back layers of deception and misplaced loyalties.

Rather than action-driven set pieces, the novel emphasizes tradecraft, surveillance, and intelligence analysis. Smiley's quiet determination and attention to detail drive a slow-building suspense that reveals the human costs of espionage.

Recommended for readers who favor cerebral spy fiction, Cold War settings, and character-led mysteries. The book rewards patience and close attention to motive and procedure.

• Cold War espionage setting
• Psychological cat-and-mouse
• Focus on tradecraft and intelligence analysis

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