冷战时，全球两大特工组织——俄罗斯“中心”与英国“圆场”明争暗斗。总管发现情报局内部潜伏着一名克格勃，怀疑对象就是包括总管助理乔治在内的几名情报局核心成员：锅匠，裁缝，士兵，穷人，乞丐。老总为查清事情策划了一次跨国间谍活动，结果惨遭失败，不久就在内部权力倾轧中失利引退。同时，也连累一批情报官员被清洗出局，其中也包括被提前退休的乔治。乔治本来有重大嫌疑，英国内阁办公室谍报总监排除了嫌疑，委托他调查内奸。于是乔治开始分别走访故人。一时间，圆场疑云密布，人人自危，究竟谁才是“地鼠”……
编剧: Arthur Hopcraft
播出日期: 1979-09-10
运行时间: 50 min
概述: Retired espionage veteran George Smiley is called out on a top-secret mission: to uncover a Soviet agent within MI6's echelons.
编剧: Arthur Hopcraft
播出日期: 1979-09-17
运行时间: 49 min
概述: British agent Ricki Tarr, believed to have defected, resurfaces with sensational information: confirmation of a Russian mole in the Service.
编剧: Arthur Hopcraft
播出日期: 1979-09-24
运行时间: 47 min
概述: The investigation begins, with Peter Guillam burgling the archives for information, while Smiley visits an old comrade whose past knowledge could prove vital to locating the spy.
编剧: Arthur Hopcraft
播出日期: 1979-10-01
运行时间: 43 min
概述: While Guillam and Tarr come under pressure, Smiley recounts his one meeting with Soviet master spy Karla, who is undoubtedly running the mole inside MI6.
编剧: Arthur Hopcraft
播出日期: 1979-10-08
运行时间: 45 min
概述: Smiley calls on ex-Circus spy San Collins, who was the duty officer the night Jim Prideaux was shot. Collins confirms the events as Smiley understands them and that Prideaux's good friend Bill Hayden is the senior officer who took charge of the case after all hell broke loose. Smiley subsequently meets with Prideaux to get a firsthand account of the events during the disastrous Operation Testify in Czechoslovakia.
编剧: Arthur Hopcraft
播出日期: 1979-10-15
运行时间: 41 min
概述: Smiley confronts one of his suspects and gives him the results of his investigations, which could prove a considerable embarrassment to those concerned.
编剧: Arthur Hopcraft
播出日期: 1979-10-22
运行时间: 43 min
概述: Smiley springs his trap and catches the mole, who confesses how and why it happened, and the answers ultimately rob Smiley of any sense of victory.
