Season 1

SI Vetri investigates the mysterious death of Amudhan, a close friend, but is forced to file it as an accident. Later, Vetri and Constable Sandhya discover blood dripping from an ice cream cart.

Vetri and Sandhya find two severed human hands in the cart. They take them to the government hospital and question Dr Pushpavalli. Later, Vetri realises that Amudhan's death is related to this case.

Vetri reopens Amudhan’s case. He goes back to the crime scene and discovers more fingerprints related to the cart case. Vetri and Sandhya talk to the other victim’s families.

Vetri and Sandhya nab Divya, who attacks them during interrogation. The forensic department cracks open Amudhan's phone and finds the fifth victim. Divya escapes the hospital after injuring Sandhya.

An unconscious Sandhya is taken away from the hospital. On the other hand, Vetri nabs Divya, who is trying to kill the mortuary attendant. Divya confesses to the crimes, but Vetri gets a threat call.

Divya, scared for her life, reveals the main culprit behind the illegal drug trials. As Vetri runs to save Sandhya, he has a masterplan prepared to arrest the one who killed Amudhan and his friends.