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When a wildlife photographer’s mysterious death is blamed on a deadly forest spirit called Vanaratchi, Crime Branch Inspector Rishi Nandhan is sent to Thaenkaadu to investigate the case, along with sub-inspectors Ayyanar and Chitra.

The lack of physical evidence and the supernatural phenomena around the murder case baffles everyone. Rishi is haunted by a mysterious ghost from his past. Meanwhile, the Vanaratchi claims another victim.

During a search for an abducted man inside the forest, police sniffer dogs get scared and behave wildly. Rishi and the team consult an entomologist regarding webspinner insects. Meanwhile, a handmade Vanaratchi doll mysteriously ends up in the hands of a little girl.

Rishi and Ayyanar have a clash of opinions. Fear spreads throughout the village as more Vanaratchi sightings are reported. Sathya assigns beat officer Kathy to help Rishi and his team in the investigation.

Sathya and Irfan try to track down poachers who conduct illegal activities in the forest. A forest night vision camera captures a horrifying video. Villagers hold an urgent panchayat meeting. Rishi and his team arrest a suspect and question her.

Panic strikes when Kathy and another forest guard go missing in the forest during a routine night patrol. Rishi’s traumatic past with Viji is revealed. Meanwhile, a young village woman gets a visit from the Vanaratchi.

The exorcism of a Vanaratchi-possessed woman gets interrupted by a group of unruly villagers. While Rishi digs deep and studies the victimology, Chitra and Ayyanar lock horns and get into a heated argument.

Sathya and Irfan are abducted and tortured by poachers. While the rescue team searches for them in the forest, Rishi, Kathy, Ayyanar and Chitra conduct an investigation of their own to find the two officers before it’s too late.

Rishi, Ayyanar, Chitra and Sathya venture into a dark and mysterious cave to investigate a crime scene. The truth behind the tribal people’s deadly ritual is revealed. Kathy decides to confess her love to Rishi.

One major clue in the investigation leads Rishi to find shocking revelations and discoveries. The team realises that the lives of many innocent people are at stake if they don’t do something soon.