John McDan, a bold and curious detective haunted by the mysterious disappearance of his father, is called to investigate a suicide that quickly unravels into a murder with dark, supernatural undertones. As he dives deeper into the case, he receives a cryptic warning from an anonymous caller, finds a hidden room filled with ancient books and summoning spells, and stumbles upon a secret ceremony to summon a demon king. When the demon reveals itself and the truth about his father's fate, John is faced with a choice that will determine not only his own destiny but also the fate of the world. "The Demonic Inheritance" is a thrilling journey into the unknown, where the line between reality and the supernatural blurs, and the past comes back to haunt the present with deadly consequences.