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.
While Kaali is kept in a witness protection facility, Sunny is recovering but still struggling with his semi-paralyzed condition. Under the supervision of Officer Gupta, Jinliang, a notorious criminal, is being deported to Vietnamese Authorities. The convoy gets attacked by armed assassins.
Akash kills all the police officers and takes Kaali and her son captive. Jinliang bargains his freedom in exchange for Kaali's life. Six months ago, when Kaali was caught by the police, Roop had taken Sunny away and was looking for his boss Dilip. Meanwhile, Swapan meets Sunny and Roop and acquires information about the drug deal.
Ambarish Mukherjee's body is discovered, and Mouni is arrested. Kaali and Dilip reach the dock and are surprised by who they see there. The police arrive at the scene and arrest Kaali, Dilip, and Jinliang. Amidst all this, Swapan escapes. Kaali is forced into the witness protection program by Sanatani.
Jinliang shoots Aniket and escapes. Sunny and Kaali too escape from the clutches of Akash. Gupta and Sanatani discover a shocking truth about Swapan. While escaping, Kaali and Sunny are kidnapped by Swapan’s goons, and Kaali and Aniket are sent with a bug to get the location of the consignment.
A flashback reveals the story behind Jinliang and Swapan’s feud. Kaali fails to get information about the consignment and is sent back to Karim, who works for Jinliang. When Kaali negotiates with Karim, Swapan’s men arrive, and a crossfire ensues. Kaali tries to rescue a group of children and Swapan raises his gun to shoot Kaali.
Swapan shoots one of his men and narrates the story of Dilip's betrayal. Meanwhile, Dilip escapes from jail and goes to Jinliang's den, where he is given a last chance to find Kaali. Gupta gets to know about Kaali and starts connecting the dots.
When Kaali reveals how big the consignment is, Swapan decides to give up and sets her free. Later, Gupta catches her red-handed while shooting Roop and blackmails Kaali to help her get to Swapan. Meanwhile, Akash tries to execute Satyaki, but it becomes impossible due to police protection.
Kaali meets Swapan and tells him that Gupta is trying to manipulate the situation. Akash attacks the hospital and injures Sanatani, but Aniket manages to kill him. Jinliang is ruthlessly killed by his higher official, Wallace. Amidst all the chaos, Swapan kills Dilip, and Kaali shoots Gupta. Swapan declares Kaali as the new queen of Kolkata’s underworld.
