The revelation that a Russian company may be building a heavy water reactor in Iran puts Jed in a difficult position as he prepares to meet with the new Russian…

The Monsignor takes an unlikely convert under his wing; Lana secures a new piece of evidence that can exonerate Kit; Dr. Arden witnesses a miraculous return.

A murderous Santa wreaks havoc on Briarcliff; Sister Jude faces off with the devil; Arden has a shocking encounter in the death chute.

The High Sparrow eyes another target. Jaime confronts a hero. Arya makes a plan. The North is reminded.