After being resurrected and pulled two and a half centuries through time, Ichabod Crane finds himself in modern-day Sleepy Hollow, where he quickly realizes that evil has awoken with him. When Sheriff August Corbin is killed by the infamous Headless Horseman, Ichabod forms an unlikely bond with Detective Abbie Mills, a young cop who has her own childhood supernatural experiences. Together, the two embark on a mission to stop evil and uncover mysteries dating back to the founding of our country. Captain Frank Irving hesitates to believe Ichabod's tales of supernatural evil. But when Ichabod's former wife, Katrina, provides clues about impending evil, they all begin to realize that this town is anything but sleepy.

Another soldier in the army of evil, the Sandman, seeps into the dreams of the residents of Sleepy Hollow. By infiltrating their minds at night, he tortures them to the brink - all because they, at one time, turned a blind eye to justice. When the Sandman seemingly sets his sights on Abbie, she is forced to begin to face her past - and her institutionalized sister Jenny. With Ichabod by her side, and her life at stake, the duo must try to defeat the Sandman and continue their fight against evil.