Aiden and Emily discover long-buried family secrets; Victoria pays Mason Treadwell (Roger Bart) a surprise visit as she gets closer to exposing Emily.

The team is called in after the remains of a psychology professor are discovered.

Abbie and Ichabod learn that Katrina is in imminent danger and race against the clock to help her.

The battle between good and evil comes to an explosive head – sacrifices must be made, worlds collide, loyalties are tested and the town of Sleepy Hollow will never be…

Ichabod enlists Henry Parrish to help him communicate with Katrina, but in the process, a menacing danger is unleashed from purgatory.

When a young boy who went missing in San Diego on Halloween suddenly reappears one year later, the BAU must work fast when another trick-or-treater disappears under similar circumstances.