Shivani Chopra is an air hostess for Air India. She lives with her sister Padmisha and her brother-in-law Mohanlal, who is a drunkard and bets all the money he can find on horse races. Shivani meets Vijay Agnihotri, a wealthy industrialist who is instantly infatuated with her, but she shows no interest in him. Vijay is the owner of his family industries; he first tries to get Shivani to model for them, but she does not even consider it. He continues to pursue her to be his lover, but is rejected every time. Vijay informs his mother, Padma, that he will only marry Shivani.
When they approach Shivani's family for her hand in marriage, they see that Shivani is marrying Ashok Chopra, an Air India pilot. Vijay is heartbroken, shocked, and disappointed, while Shivani and Ashok get posted right after their wedding and move to America.
Four years later, Vijay cannot forget Shivani and turns down all the marriage proposals brought by his mother. Shivani and Ashok have a daughter, Pinky. Shivani left her job as an air hostess and began volunteering at a hospital for the mentally and physically disabled. Vijay befriends Ashok in hopes of getting closer to Shivani. He plans to start his own airline, where he hires Ashok as a general manager with a high salary. Unaware of Vijay's intentions, Ashok doesn't believe Shivani who tries to convince him of Vijay's true colours.
Vijay gives Shivani and Ashok a new company home. After moving in, Shivani finds out she is pregnant. She shares the news with her husband, but Vijay interrupts, revealing that he's used Shivani's photos as advertisements for the new airline. This enrages Shivani, who demands that Vijay leave and then insists that Ashok quit his job as well as the new house, and that she will work to support the family instead. Insulted and angered, Ashok slaps and disowns Shivani, who leaves the house, much to his great regret.
Vijay witnessing this has an episode and severely beats Ashok. When he is hospitalized, Vijay removes Ashok's oxygen mask in the presence of Shivani thereby killing him. She attempts to convince the police that Vijay is responsible for Ashok's death. However, Vijay bribes his friend, Inspector Arjun Singh, to provide an alibi and is not charged. Despite Arjun telling him that what he did was wrong, Vijay refuses to stop thinking about Shivani and giving up. All this while, he visits and begs Shivani to say she loves him. As she refuses, he beats her up and frames her for his attempted murder. She is sentenced to 3 years in prison as she could not prove her innocence. Pinky is placed in the care of Padmisha and Mohanlal. Mohanlal mistreats his wife and calls Pinky a burden.
Shivani meets Nisha, her cellmate who was wrongly accused of murder in a case of dowry. They share their pain in prison under the watch of a brutal prison warden, who would force the prison inmates into prostitution for political leaders at night. In an attempt to escape from prison, she makes a complaint about the brutality of her prison guard but her plea is ignored. Instead, Inspector Arjun reveals to the warden that it was Shivani who filed a complaint against her illegal activities.
Mohanlal forces Padmisha to disown Pinky, but she refuses. In response, he kicks both Padmisha and Pinky out. Vijay accidentally kills Shivani's sister and daughter by running his car over them. Shivani learns about their deaths and realizes Vijay is the one who killed them. She decides to go to any length to avenge her family. Prior to this, Vijay visits Shivani in prison with the promise of freeing her (as well as news about his alleged relationship with another woman who bears her name), but Shivani still refuses.
One day, Shivani vomits during a politician's visit to take a prisoner for the night. When the prison guard learns that Shivani is pregnant from the visit, she gives her a severe beating and throws her into a dark isolation cell, which causes her to have a miscarriage. With all of her loved ones dead, Shivani was numb to the world. Her only motive to live now was exacting revenge on all the people who wronged her.
She begins with the prison guard by planning a night-long worship event at the jail, staging an alibi for herself. Shivani sneaks away and kills the prison warden by dragging her to the gallows and hanging her. As there is no evidence and a strong alibi, Shivani is not convicted of it.
Three years later, Shivani is released from prison. First, she kills Mohanlal by choking him with rupee notes and chewing off a significant amount of flesh from his arm. Inspector Arjun suspects Shivani of the murder. While Shivani is mourning her daughter at her grave, Inspector Arjun steps right on her grave to rudely intercept her. He chases her and tries to rape her in a barn. However, Shivani overpowers him and sets the barn on fire, leaving him to die.
Shivani visits Vijay's home but learns that Vijay and his mother moved out of there two years ago. She decides to dedicate her life to serving the disabled at the hospital she used to volunteer at. The doctor there suggested she stay at their new sanatorium in Tikamgarh. When she gets there, she finds out that the sanatorium was built by Vijay's mother. Shivani finds Vijay in a paralyzed state at the sanatorium, losing his ability to move due to the car accident which killed Shivani's sister and daughter. She volunteers to rehabilitate him.
Vijay gets cured with Shivani's love and attention. Vijay tells Shivani once again to say she loves him and to marry him, as she has no other options in life. Shivani embraces him before stabbing him. She confesses that she nursed him to health for one purpose: to kill him, as it is a sin to kill an incapacitated person who cannot defend himself. In their scuffle, they end up dangling from a cliff with Vijay hanging onto Shivani's foot. Vijay says that if he falls to his death, he shall take Shivani with him. Deciding that it is more important for Vijay to die than for her to live, Shivani lets go, causing them both to fall to their deaths.
