The Circus, a shadow branch of MI6 led by Control (John Hurt – Alien), is tasked with covert assignments of intelligence during the Cold War. After a botched overseas mission, both Control and his right hand man George Smiley (Gary Oldman – The Dark Knight) are made scapegoats and relieved of their duties. Months pass and it’s suspected that Circus could in fact be compromised by the Soviets which would lead to potentially destructive repercussions on the world stage. Smiley is approached by the Prime Minister and is asked to investigate this potentially fatal breach in MI6 from the outside. He accepts and begins to uncover a plot far greater than he previously suspected.