One of the most respected inspectors, Arjun Joglekar, is killed by drug dealer and gangster Goli. Mona, a cabaret singer and Goli's mistress, agrees to testify against Goli and is placed into witness protection by Inspector Karan, Arjun's younger brother, who aims to fight any injustice and avenge his brother's murder. When Goli finds out about Mona's forthcoming testimony which would expose his real identity, he tracks her down and kills her and Karan, despite being present at the scene, is unable to do anything. Karan approaches the DCP for a warrant to arrest Goli but, the DCP refuses, saying it will be futile since Goli is an influential person.
Deepak Kumar, who is the most romantic actor around, is frustrated with his roles and for being type-cast as a romantic hero. He would like to do something different and bring some change and excitement to his dull and boring existence. To change his monotonous life, he gets drunk and drives around. He is arrested by the police and brought to his rowdy producer. Karan also arrives at the place to confront the producer for molesting a girl who had come to him earlier for a job. When the producer refuses to comply and calls goons to threaten Karan, the latter thrashes them all, impressing Deepak, who would like to study his behaviour so that he can use this as a background for his next movie.
Karan meets Basanti, who looks identical to Mona. He tells Deepak that the latter can hang around him if Deepak can get Basanti to act as Mona. Deepak trains Basanti and presents the new "Mona" to Karan. Karan places Basanti at the Moonlight Hotel as an amnesiac Mona, where she can report Goli's criminal activities. While Karan and Basanti fall in love with each other; Deepak falls in love with Karan's sister, Shivangi, which makes Karan mad and he tries to get rid of Deepak and almost succeeds in doing so. However, Deepak finds out and angrily confronts Karan, and leaves the house. Karan's sister is heartbroken; his sister-in-law makes him realize his wrongdoing. A remorseful Karan goes to Deepak and apologizes to him; Deepak forgives him and the two make up.
Meanwhile, Goli has started seeing Karan as a thorn in his illegal activities and decides to have him killed. However, constable Ramlal, who is loyal to Karan, spots the assassin and takes the bullet. Karan is unable to save Ramlal, who dies in his arms making Karan even more determined to get Goli. Goli finds out the truth about Basanti, who tells him that Karan has already found some incriminating evidence against him and will be presenting it in court. Goli calls Karan and tells him to hand over the evidence to him in exchange for Basanti's life. Deepak meets Goli to give him some films supposedly containing the evidence Goli wanted and tells him to hand over Basanti before Karan comes with the police to arrest him. However, Goli reveals to have also kidnapped Karan's sister and sister-in-law, much to Deepak's shock and dismay. Karan, who has been hiding with a gun some distance away, starts shooting at Goli and succeeds in gunning down many of his henchmen, while Deepak tries to escape with the three ladies in a car. Unfortunately for them, the car breaks down and Karan's location is also revealed, resulting in all of them getting captured. Goli holds Deepak, Basanti, Karan's sister and sister-in-law hostage and tortures Karan for the evidence. Karan pretends to faint and gets into a brutal fight with one of Goli's henchmen (the same one who killed his brother) and ultimately kills him. He then opens Deepak's bonds and a huge fight ensues between the duo and Goli and his cronies, which ends with Goli's death at Karan's hands.
In the end, everyone goes to watch Deepak's new movie. Halfway through the movie, Karan realizes that Deepak's dialogue resembles the same things he once himself had said to Deepak and walks away in a huff. Outside the hall, he meets Deepak, and the two share a smoke with Deepak accidentally setting fire to his own pants but douses it immediately. The two friends share a laugh as the film ends and the credits roll in.
