He is called upon to investigate the presence of a Soviet mole in the Circus .
George Smiley : Educated at Oxford , he was a senior officer in the Circus , before being eased out upon Operation Testify 's failure .
George Smiley is called upon to investigate the presence of a Soviet mole in the Circus .
George Smiley : Educated at Oxford , he was a senior officer in the Circus , before being eased out upon Operation Testify 's failure .