A murderous Santa wreaks havoc on Briarcliff. Sister Jude faces off with the Devil. Arden has a shocking encounter in the Death Chute.
Sister Mary Eunice is terrified to discover a dark angel has descended on Briarcliff. Kit makes a bold move to be reunited with Grace.
An investigation gets messy when a body is found in a shower, and Booth and Brennan's relationship disrupts the team.
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