Elsie Bainbridge, a newly widowed woman, is sent to her late husband’s crumbling estate, The Bridge, where strange wooden figures lurk in locked rooms and seem to move when no one is watching. As the house’s history bleeds into the present, grief, isolation, and madness intertwine, revealing horrors rooted deep in the past.

Peter Grant, a probationary constable in the Metropolitan Police, expects a quiet career until he interviews a ghost who claims to have witnessed a brutal murder. Recruited into a secret branch that investigates magical crimes, Peter begins training under Chief Inspector Nightingale while pursuing a killer tied to something far older than modern London.