Plot summary
Mills and Crane interrogate the Horseman with Andy's help, despite the dead policeman's warnings not to do so. During the interrogation, the Horseman reveals himself to be Abraham Van Brunt, Katrina's former fiancé and Ichabod's friend who was killed by Hessians and turned into the Horseman by Moloch. Brooks, under Moloch's control, sneaks a druidic relic into the chamber where the Horseman is being held and uses it to free him. This allows Moloch's hellish minions to be summoned into the chamber, who escape with Brooks and the Horseman in tow.
Credits
Adapted from Wikipedia contributors, Sleepy Hollow season 1. HTML formatting and reference markers removed.