| Director | R. Ajay Gnanamuthu |
|---|---|
| Country | India |
| Budget | ₹15 crore |
| Box office | ₹85 crore |
On 6 June 2009, Samuel "Sam" Richard, a cancer survivor, is found hanging, alongside his friends who fell from an apartment building. Debbie, Sam's wife, suspects foul play. A few years after Sam's death, Debbie's mother is outraged upon discovering Debbie's continuing attempts to conceive using Sam's preserved sperm through artificial insemination, even after miscarrying twice, sparking tension between Debbie and her parents. Debbie is closer to Sam's father Dr. Richard.
Six years after Sam's death, Debbie on her way to her Chinese restaurant inauguration, witnesses an astrologer's suicide on 6 June 2015, and stumbles upon Srinivasan "Srini". Sensing Sam's presence, she consults a Daoshi to communicate with Sam's spirit. Meanwhile, in Hyderabad, Raghunandhan and his half-sister Aishwarya contest in the court against Srini, their estranged brother for inheriting 70% of their deceased father's worth estate. Simultaneously, the Daoshi sends Debbie to the spirit world, where she sees Sam trapped and she scribbles "help". Simultaneously, Srini who had fallen to his death from the flat awakens. Debbie writes "This will repeat", with a doublet image of Srini's face, hinting at a mysterious connection.
On 6 June 2021, six years after Srini's accident, the Daoshi advises Debbie to perform a Mahakala Mahayana Pooja for Srini, who lies in a vegetative state under Richard's care. Raghu obtains a court order for Srini's passive euthanasia, aiming to claim the 70% inheritance. However, Debbie warns Raghu that harming Srini will seal his own fate. A revelation emerges: Raghu and Srini, born from the same atom, are cosmically entangled, destined to die together. Their intertwined fates are rooted in the 2015 incident, where not only Srini survived his fatal accident, but at the same time, Raghu survived an exactly similar fatal accident.
Richard and Debbie's investigation leads to a mysterious book, Unsung King of a Fallen Kingdom, previously read by Sam and Raghavan (Srini's friend). This book had only been checked out once in six years, and the borrower mysteriously died on 6 June, and the book was every time recovered and returned to the library through a librarian. Further research uncovers Raghavan's script, "Demonte Colony", exposing an evil force that claims a chain killing the chain's holder, trapping the spirits of the dead. Richard implores Raghu to intervene, breaking the cycle to allow his son's spirit to rest in peace.
Debbie, Raghu, and advocate Dhayalan safeguard the Demonte house to prevent any entry into the house to avoid fuelling Demonte's terror. Despite the Daoshi's caution, Raghu, Dhayalan, and the inspector, rush into the house after hearing a scream. Inside, they find four captive girls held by three female ghosts, who vanish upon Raghu's arrival. Adithi, one of the girls, reveals they were teleported from their hostel after reading the mysterious book. Dhayalan's investigation identifies librarian Alphonse as the book's provider. Adithi confesses to chanting hymns to obtain the chain, secretly placing it in Raghu's coat. The Daoshi, fearing for Srini's life, instructs the monks to perform Mahayana pooja, utilising the phurba if necessary.
Raghu, Debbie, and the Daoshi get trapped in the restaurant, where they watch a video showing Raghu getting possessed and killing them. The video abruptly ends, and they discover the Sigil of Baphomet, linked to Satanic worship. The Daoshi begins rituals as the chain heats up, causing Raghu distress, and Richard is choked to death. Demonte's spirit arrives, kills the Daoshi, and possesses his body to attack Debbie. Raghu supported by the Mahayana pooja kills the possessed Daoshi. Dhayalan and Adithi track Raghu and Debbie, only to find an empty restaurant. Raghu breaks a window but finds them trapped. A swarm of bats attacks, prompting Debbie to recall the buried Mahakala statue. As they plan to break the glass dome above the Mahakala statue, Sam's spirit appears among the bats, revealing Debbie's pregnancy and asking for help. Raghu realises it is Demonte's spirit instead. Demonte attacks Raghu, and he is not able to retrieve the chain.
Raghu kicks the phone to Debbie, enabling her to contact Dhayalan. Demonte's spirit possesses Srini, disrupting the ritual and initiating the sacrifice, burning the daoshi. Dhayalan and Adithi arrive just in time to rescue Debbie. A monk intervenes, striking the phurba on the wall, stopping the human sacrifice midway. The police arrive to find the chain missing again. Srini recovers, but Raghu falls into a coma. Debbie reveals Demonte's true intention of performing the sacrifice for a 15th-century Portuguese king, confirmed by Adithi. The haunted house of Alphonse Gerald, the librarian, is discovered where he self-sacrificed and tortured himself to appease Demonte. The photographs of annual sacrifices to Demonte expose the sinister cycle.
In rural Bihar, a mysterious figure is seen limping, carrying photos of sacrificed victims. The figure kills another person, offering it to Satan. Srini resolves to find him, his family, and their connection to Demonte, and end this cycle to rescue Raghu, and break the curse by 6 June 2027.