John le Carré - The Spy Who Came in from the Cold (1963), "The story follows Alec Leamas, a British spy nearing
the end of his career, as he is tasked with an elaborate deception to bring down a high-ranking East German intelligence
officer. Leamas must convincingly defect and become a disillusioned double agent, sacrificing his reputation and even
enduring a prison sentence to establish his cover. As the intricate plot unfolds, with its multiple twists and turns,
Leamas finds himself caught in a complex web of deception orchestrated by his own side, questioning the very loyalties
and ideologies he has devoted his life to."
henrykisor.com and
Kobo Books