After inheriting a crumbling manor in a fog-shrouded town, a troubled veteran is haunted by vivid dreams where a spectral hound leads him to grisly ritual sites. The border between nightmare and reality frays as he chases clues through candlelit tunnels beneath the estate, determined to confront the unseen cult that orchestrated his ancestor’s heroic downfall—only to discover his own fate is tied to the dog’s in a final, bone-chilling ceremony.