"The Spy Who Came in from the Cold" is a novel by John le Carré, published in 1963. It is a spy thriller set in the Cold War and tells the story of Alec Leamas, a disillusioned and burnt-out British spy who is sent to East Germany on a risky mission. The novel explores themes of betrayal, loyalty, and the moral complexities of espionage. It is known for its realistic portrayal of the inner workings of the intelligence community and its portrayal of the tense political climate of the time period. It has received widespread critical acclaim for its complex characters, fast-paced plot, and its portrayal of the grey areas of morality in the world of espionage.