 Over the course of the novel, Guillam grows progressively paranoid and anxious regarding the investigation, at one point doubting the veracity of Tarr's allegations.When the mole is finally identified, Guillam loses his temper and physically attacks him, having to be restrained by the other men in the room.By the time of the events in "Smiley's People" (the third book in the Karla trilogy) Guillam is married to a young Frenchwoman called Marie-Clare and is head of Circus operations in Paris, though this too is considered to be a minor post.