When an Oregon woman is found dead in an abandoned asylum, the Behavioural Analysis Unit realises that the victim is part of a series of gothic, ritualistic murders and the suspect might be a Satanist.
Raylan confronts a crisis that threatens the marshals' careers; Duffy, Mike and Katherine mull the meaning of loyalty.
The mole kidnaps one of the NCIS agents. Plus, the team are left completely in the dark when Hetty goes rogue.