It is spring in 1963 and George Smiley has left the Circus. With the wreckage of the West's spy war against the Soviets strewn across Europe, he has eyes only for a more peaceful life. And indeed, with his marriage more secure than ever, there is a rumor that George Smiley might almost be happy.
But in his absence, the shadows of Moscow have lengthened. Smiley soon finds himself entangled in a perilous mystery that will define the battles to come and set him on a collision course with the greatest enemy he will ever make.