The Fall of Sir Douglas Weatherford follows Kenneth McKay (Mullan), a recent widower and enthusiastic tour guide at a dusty visitor centre in the small town of Arberloch, dedicated to his alleged ancestor and notable Enlightenment figure Sir Douglas Weatherford. When Arberloch becomes a shooting location for a successful fantasy TV show, and Sir Douglas’ local renown is threatened by the pop culture phenomenon, Kenneth’s world gets turned upside down, and he takes it upon himself to preserve his legacy at any cost.