Alec Leamas is the world-weary, disillusioned British spy protagonist of John le Carré's 1963 novel The Spy Who Came in from the Cold. A tough, working-class veteran of the secret service (the Circus) who runs agents in Cold War Berlin, haunted by past failures, and becomes a pawn in a complex betrayal plot involving a feigned defection and a tragic romance with Liz Gold, highlighting themes of moral ambiguity and the brutal realities of espionage.