The time is 1973. Britain’s Secret Intelligence Service (SIS), code-named the Circus, is striving to keep pace with other countries' espionage efforts. There is a gnawing fear that the Circus has long been compromised by a double agent, or mole, working for the Soviets. George Smiley, a career spy with razor-sharp senses, tries to track the mole. Even before the startling truth is revealed, the emotional and physical tolls on the players enmeshed in the deadly international spy game will escalate…