PLOT:
At a storm-battered railway platform in Mangalpur, stranded travelers listen to an old mystic narrate the legend of Vadhusur, a demon who had been granted immortality by Lord Shiva, and could only be killed by his own hand or bloodline. Betrayed and killed by a celestial apsara during their wedding ceremony, Vadhusur's ghost wanders the world in search of revenge. Vadhusur still exists as a vengeful spirit. He feeds on newly married women and haunts the local Acharya Palace. Years later, Dushyant Acharya (Guruji) fakes his death and leaves the estate to his grandchildren Arjun and Meera. Arjun decides to restore the palace for Meera’s wedding despite warnings from local caretaker Shantaram. On his way he encounters a writer named Priya who is looking for her missing sister and saves her from an accident. Soon after Arjun arrives, he is briefly electrocuted in the palace bathroom and killed temporarily, but Priya revives him with CPR.

As the wedding approaches, Guruji's dark secrets are revealed. Guruji had constructed an automated device that played sacred mantras to keep Vadhusur dormant, but his son Madhav, out of jealousy for a woman named Yashodha, sabotaged the device, causing it to play in reverse. In the process, Madhav becomes partially possessed as Vadhusur's physical vessel. Vasudev was made to step aside and Yashodha’s real love brought up her son Arjun as his own which means Arjun is actually Madhav’s biological son and has the bloodline of Vadhusur. Meanwhile a priest sent to help warns that evil grows in darkness and suggests the wedding be completed in the day and the couple cross the Ganges before sunset. However, Guruji arranges Meera’s marriage in the palace so that he can use her as the 13th and the final sacrifice required to fully resurrect Vadhusur and free Madhav.

The groom’s family insists on an auspicious nighttime wedding, despite Arjun’s objections. Possessed electrician Sunder shuts down the generator, plunging the palace into darkness, and Madhav abducts Meera to a subterranean temple. Vasudev and the priest go inside a sealed-off prayer room to restart the sacred mantra device and weaken the demon while Arjun confronts his biological father. Arjun uses his bloodline to impale Madhav with a lightning-charged branch from the apsara’s sacred tree, destroys the ritual, kills the corrupt Guruji, and saves Meera who awakens with no memory of the terror. Arjun angrily confronts the groom's priest for forcing the wedding at night and after the ordeal declares that birth charts are written by humans, not gods. Moments later, the clip from their earlier visit to the temple shows that 'Priya' is none other than the ghost of her murdered twin sister, Chitra. Back at the platform, the mystic reveals himself to be an aged Arjun and explains that he got the ability to see spirits after being electrocuted earlier and has spent the past 24 years performing rituals to bring peace to the soul of his biological father.