Kaali, a masseuse, has her life turned upside down when her son, Sunny, meets with an accident and her husband, Tanmay, is arrested for murdering a drug dealer.

Kaali desperately seeks a way to arrange money for Sunny's operation, and selling the drugs hidden by Tanmay in the house, seems to be her only way out.

Kaali steals a drug consignment and negotiates for Sunny’s life. Special Branch Officer, Aniket Bose's interrogation of Tanmay, raises his suspicion of him.

Kaali’s attempt to sell the stolen consignment, leads to bad blood between her and the drug mafia. Her past lover, Aniket Bose, resurfaces in her life through the ongoing investigation.

Kaali experiences more violence as she tries to escape the drug mafia. Aniket's suspicion strengthens as he uncannily crosses paths with Kaali at odd places.

A betrayal lands Kaali in the hands of the drug mafia. She escapes and tries to seek refuge from the police. Will the cops help her?

Despite Aniket's warnings, Kaali agrees to lead the police into Dilip's den. Kaali is dumbstruck when she learns of OC Mitra's true intentions.

Aniket arrests Kaali after a bloodbath with the mafia. A shocking turn of events brings Kaali to the realisation that the drug mafia has plagued Kolkata.