London: Heinemann, (1965). First edition. An incompetent British intelligence agency known as "The Department" and its multiple botched attempts to verify a Communist defector's story of a Soviet missile build-up in East Germany. INSCRIBED BY LE CARRE on front endpaper, "S. Sanders/ best wishes/ John le Carre." Page edges foxed and two small stains to rear pastedown otherwise near fine in very good or better dust jacket with inconspicuous creases, touch of finish separation, and red on spine mellowed to pink, as is endemic to this jacket (lettering still quite readable).