In a desolate post-mortem room in Africa lies the acid-scarred corpse of a young woman. Bound to her hand is a forbidden Igbo talisman?an *Ogu*. When forensic pathologist Arka Goswami set out to perform the autopsy, he had no idea that, unwittingly, he was about to commit the most terrifying mistake of his life. Gradually, Arka begins to sink into an abyss of darkness from which there is almost no return. His childhood friend Palash and his wife Oindrila launch a desperate battle to save him. Meanwhile, one mutilated corpse after another is discovered across the city's alleys. A terrifying nightmare has awakened. Now, no one is safe.