The film begins with two Indian agents working under Ranvir Singh (Manoj Bajpai) chasing an international arms dealer Mikhail, who has been on the radar of several intelligence agencies, but instead he kills them both and escapes. A year later Shabana Khan (Taapsee Pannu) a college student who is also a Kūdō fighter is being followed by Indian agency as a potential recruit. One of Shabana's friends, Jai (Taher Shabbir) who likes Shabana, and always tries to hit on her, asks her on a date a day before his birthday, she agrees to go with him on the date and there he confesses his love for her. During the date he asks her about her past, and Shabana tells him that she had been kept in juvenile detention for killing her abusive father who used to physically assault her mother. During their bike ride home Shabana is a victim of eve teasing from a group of four drunk men in a Jeep, with the exchange turning into a physical altercation resulting in Jai getting killed and the assailants running away. Later though identified bit being influential person, he escapes justice. Soon after, Shabana receives a call from an unknown number asking if she wants to avenge her lover's death. The unknown caller agrees to help her terminate the killer in exchange for Shabana joining a secret agency. Shabana agrees to this and accordingly receives information on the killer's whereabouts and the promised help that would aid her in killing them. Shabana then goes to Goa, to the same hotel where the main culprit who killed Jai was staying. As instructed, Shabana enters his room killing him and later escapes with the help of Ajay Singh (Akshay Kumar). The unknown caller is then revealed to be agent Ranvir Singh.