The film opens with a secret police operation orchestrated by Shivani Shivaji Roy (Rani Mukerji), a dedicated Crime Branch Senior Inspector of the Mumbai Police, in order to catch a pimp named Rahman from his hideout. Shivani barges in with her team and arrests Rahman, and rescues his mistress. Shivani lives with her husband, Dr. Bikram Roy (Jisshu Sengupta), and niece, Meera (Avneet Kaur). Prior to the film, she rescued an orphaned girl named Pyaari from her uncle, who was about to sell her, and started looking after her like her own daughter. One day, Shivani finds out that Pyaari has been missing from her shelter home from 5 days and begins an investigation, where she finds out that the mastermind behind this kidnapping is a Delhi-based kingpin named Karan Rastogi (Tahir Raj Bhasin), who runs a cartel involving child trafficking and drugs. Shivani takes the task personally, going beyond her job and duties to nab Karan.
Shivani forces Rahman to reveal the names of Karan’s associates and comes across Sunny Katyal (Anant Vidhaat Sharma), a car-dealer who operates Karan’s trafficking business in Mumbai. Karan comes to know that Shivani is monitoring his cartel’s activities and tries to have Katyal killed for becoming a liability. However, Shivani saves Katyal, and he agrees to help her nab Karan. Determined to catch him, Shivani tracks down Karan’s aide, Wakeel. Karan, angered, makes sure that Pyaari is sold and raped every day. As a warning, he spreads fake news that Shivani’s husband has misused his profession as a doctor to molest a female patient, causing Bikram to be thrown off-duty. He then chops off one of Pyaari’s fingers and sends it to Shivani’s house in a gift box. Meanwhile, Karan’s right-hand man Mattu (Aman Uppal) gets a contract to host a party full of prostitutes from a man named Tandon on the behalf of a minister in Delhi, Taneja ji. Mattu also kills one of the girls in Karan’s brothel at his orders when she contracts dengue, thus further scaring Pyaari.