When historian Alex Carter returns to his childhood home after the sudden death of his estranged father, he plans to quickly settle his father's affairs and leave Blackthorn House behind forever. But when Alex stumbles upon a hidden diary filled with cryptic entries and strange symbols, he begins unraveling the dark history of the house-and its former resident, Matthias Blackthorn, a man consumed by dark magic. As Alex digs deeper into the house's past, terrifying paranormal activity begins to escalate. Shadows move on their own, cold whispers echo through the halls, and Alex soon realizes that Blackthorn House is still home to a powerful demonic entity. What begins as an investigation into the house's history becomes a fight for survival as the malevolent force targets Alex, determined to drag him into the same madness that claimed his father. In a desperate attempt to exorcize the demon, Alex teams up with a local priest and an occult scholar, but with each passing day, the line between reality and nightmare blurs. The deeper Alex delves into the house's secrets, the more he fears that he may be too late-not only to stop the demon, but to save himself from its grasp. The Shadow of Blackthorn House is a gripping tale of dark magic, demonic possession, and one man's battle to confront the sins of the past before they consume his soul. Will Alex find a way to end the curse, or will he become the next victim of Blackthorn House's long legacy of terror?