Plot summary
Mills' superior Frank Irving ( Orlando Jones ) reluctantly allows her to work with Crane due to the events occurring in Sleepy Hollow; the two begin using Corbin's gathered archives of occult material. Elsewhere, Andy Brooks ( John Cho ), a former fellow deputy who was killed in the previous episode assisting the Horseman, is reanimated and given new orders to resurrect the witch Serilda of Abaddon ( Monique Ganderton ). Serilda completes the ritual for her resurrection by hunting down and killing the descendants of the magistrate who burnt her for witchcraft centuries ago, but Crane and Mills destroy her with explosives. Mills has a dream/vision of Corbin, who tells her not to be afraid of '49' - the number of the room in the mental hospital in which her sister Jenny ( Lyndie Greenwood ) resides.
Credits
Adapted from Wikipedia contributors, Sleepy Hollow season 1. HTML formatting and reference markers removed.