Crime Branch Inspector Rishi Nandhan is sent to Thaenkaadu, with sub-inspectors Ayyanar and Chitra, to investigate the death of a wildlife photographer whose body was found in the forest hanging on top of a tree, wrapped in a big web-like cocoon.

The supernatural phenomena tied to the murder and the lack of physical evidence baffle everyone. However, Rishi believes it to be a serial murder case and his instinct turns out to be right when they learn about a previous death in a similar manner.

Rishi and his team investigate the baffling kidnapping of a construction contractor. A little girl mysteriously ends up holding a handmade Vanaratchi doll.

As the fear of the Vanaratchi spreads rapidly in the village, Faria worries about Sathya and Irfan going to work in the forest. Ayyanar and Rishi get into a disagreement over supernatural phenomena. The Vanaratchi claims another victim.

Rishi and his team investigate the murder of a tea factory owner. Sathya sees a video that reveals a terrifying sight; the villagers gather for an urgent panchayat meeting to discuss the Vanaratchi murders.

When Kathy and a forest guard disappear in the forest during a routine night patrol, panic ensues. The reasons behind Rishi's scepticism and his traumatic past with Viji come out. The Vanaratchi visits a young village woman.