After Ichabod risks his life to rescue Abbie from Purgatory, the two face even greater danger as sinister forces in Sleepy Hollow gain momentum. With Katrina held captive by the Headless Horseman, and Frank Irving mysteriously back from the dead, Ichabod and Abbie must rely on instinct to know who to trust in their quest to permanently vanquish Moloch – and stop the apocalypse.