 In the aftermath of the apparent suicide of a suspected communist whom Smiley had previously exonerated, Smiley quits the Circus in order to conduct his own private investigation, relying on Guillam to provide him inside information pertinent to the case.He appears again in a minor role in "The Spy Who Came in From the Cold", again in the role of Smiley's assistant.Guillam is a major character in "Tinker Tailor Soldier Spy", which retcons the chronology of "Call for the Dead" to make Guillam only forty in 1973.