Abbie and Crane's search for a missing Sleepy Hollow child reveals a creature akin to the Pied Piper, whose legacy with the child's family extends back to a centuries-old curse.

Sheriff Corbin's son returns from war, but his strange behavior leads Abbie and Ichabod to question his intentions.

A series of mysterious deaths at Tarrytown Psych leads Abbie and Ichabod to discover that an especially surprising spirit is involved.

Reeling from the events of their standoff with Moloch, Ichabod and Abbie encounter an angel, Orion, that they believe can help them. Meanwhile, Katrina searches for the humanity in Abraham.

After escaping Purgatory, a warlock who triggered the Salem witch trials returns to find a dangerous book of spells. Meanwhile, Abbie attempts to trust Frank Irving again, while Henry struggles to find his identity.

The town of Sleepy Hollow and its inhabitants are permanently changed; a relationship is destroyed beyond repair.