The Cold War’s tensions are palpable as Control, the head of British counter-espionage, seems increasingly overwhelmed. His failing health creates a tense atmosphere among his staff, who appear eager to step into his position. Smiley, a respected but previously inactive agent, emerges as Control's favored successor, though it becomes apparent that the older man’s motives are not entirely straightforward and he suspects a mole within his organization. The question then is: who can be relied upon to uncover this betrayal? This seven-part BBC series gradually reveals pieces of the puzzle as Smiley pursues the truth. A strong supporting cast including Ian Bannen, Anthony Bate, Bernard Hepton as the unpleasant Esterhase, Ian Richardson as the slippery Haydon, and Michael Aldridge as the ambitious Percy, fills out the ranks of those who are either helpful or under suspicion. With so many individuals vying for advancement, Smiley and his aide Guillam find themselves unsure of whom to trust as this intricate story of deception unfolds. John Irwin and Arthur Hopcraft have adapted John Le Carré’s novel with great care, paying close attention to detail. The narrative is full of hints and misleading clues, and the methodical search for the traitor is skillfully portrayed through a Guinness performance that, like the series itself, relies more on creating an atmosphere of danger and deception than lengthy conversations – though moments of integrity do surface. This represents BBC drama at its finest: deliberately paced, filmed in close-ups to avoid sensationalism, thoughtful, and showing how layers of intrigue operated within each other; or perhaps it was a situation where secrets resided within secrets.

Source on TMDB