premise: Tinker Tailor Soldier Spy is a 1974 spy novel by British author John le Carré. It follows the endeavors of taciturn, aging spymaster George Smiley to uncover a Soviet mole in the British Secret Intelligence Service. Since the time of its publication, the novel has received critical acclaim for its complex social commentary and lack of sensationalism, and remains a staple of the spy fiction genre.
hypothesis: The character of George Smiley is part of the British Secret Intelligence Service.
reason: We only know that "spymaster George Smiley" tries to uncover a Soviet mole in the British Secret Intelligence Service, but we don't know if Smiley is a member of the Service; the algorithm assumed it because he's described as a spymaster and has a mission.