Hate Story IV is the fourth in the Hate Story series and is a revenge drama. The story follows two brothers; Aryan Khurana (Vivan Bhathena) and Rajveer Khurana (Karan Wahi) who run an advertising agency in England. Their father (Gulshan Grover) is due to contest mayoral elections in England. Aryan and Rajveer sign Taasha (Urvashi Rautela) as a model for their client’s advertising campaign. From the two the younger brother Rajveer, who is a Casanova, falls head over heels for Taasha and wants to sleep with her but elder brother Aryan tells him to win her heart instead. Aryan himself is in a relationship with Rishma (Ihana Dhillon) who works for their company. But he has a glad eye for Taasha too.
Aryan is shocked when one day, when Rajveer proposes to Taasha right in front of him, Rishma and many others. Unable to bear the prospect of losing Taasha to his younger brother, he sends Rajveer and Rishma out of the city for an ‘urgent meeting’ so that he can sleep with Taasha. He spikes Taasha’s drink and gets intimate with her. Taasha is devastated the next morning but Aryan tells her to keep their intimacy a closely-guarded secret so as to not break Rajveer’s heart. However, things go awry when Aryan and Taasha realise that somebody has clicked pictures of the two of them in bed together. Soon, Rishma confronts Aryan for cheating her. In a scuffle between Aryan and Rishma, the latter is killed accidentally – right in front of Taasha’s eyes.
Aryan decides to dispose of Rishma’s body. He makes it appear as if Rishma has gone to a resort on a holiday. As per plan, in a few days, he would make it appear that Rishma has gone missing from the resort. Meanwhile, Taasha starts staying aloof from Rajveer who suspects, something is amiss.
Soon, it becomes clear that things are not as straight as they appear. Taasha is actually out to seek revenge from the Khurana family. What revenge is Taasha seeking? Who had wronged her and how? Does she avenge the wrong? Or do Aryan, Rajveer and their father prove too smart for her? Does Taasha have the support of anyone else?