Scholar Dr. Black's seemingly mundane assignment of sorting through the assets of the Barchester Cathedral library takes an eerie turn when he comes across the papers of the late Archdeacon, who plotted to gain his position through murder. However, he soon comes to discover something truly horrific about the wooden choir stalls in the church, which are tied to a famous local tree and a sinister local legend.

A university professor, confident that everything which occurs in life has a rational explanation, finds his beliefs severely challenged when, during a vacation to a remote coastal village in Norfolk, he blows through an ancient whistle discovered on a beach, awakening horrors beyond human understanding.