John le Carré's novel was based on the uncovering, during the 1950s and 1960s, of the Cambridge Five traitors, who were K.G.B. moles working within the S.I.S. It is the first book in le Carré's Karla, or Quest for Karla trilogy, the second and third parts being The Honourable Schoolboy (1977) and Smiley's People (1979).

Film

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