Plot

A contract killer escapes after murdering a politician and must help the cops find a murderer after a slain officer's memories are transferred to his brain.

Ismart Shankar is a crazy contract killer who murders a high profile politician, Kasi Viswanath. Cops start chasing him and Shankar escapes with his girlfriend Chandni. On the other hand, Arun is a cop who is handling the same case. Just when he is about to nab the actual culprit behind the murder, he gets killed. In a crazy turn of events, the cops transfer Arun's memory to Shankar with the help of Arun's girlfriend Sarah to get the case details.

ISmart Shankar is a street-smart assassin who works under another assassin named Kaka. One day, Shankar encounters a rough woman named Chandini, when he was extorting money from an apartment complex builder. Impressed, Shankar falls for Chandini and tries various ways to impress her. Despite being annoyed at first, Chandini realizes her mistake. Under Kaka's orders, Shankar kills CM Kasi Vishwanath and escapes to Goa with Chandini. However, the cops learn about their location and a shootout ensues where Chandini gets killed and Shankar getting arrested.

Meanwhile, Sara, a Neuro-scientist who is working on memory transfer has achieved successful results with rats. Sara's boyfriend/fiance Arun is a CBI officer, who is investigating Kasi Vishwanath's murder, believes that a higher force had planned and killed him. Shankar gets released from prison and deduces that Kaka had a major role in Chandni's death and has been ordered to kill him as well. Kaka tries to escape, but Shankar shoots Kaka in Sara's car and flees while Sara calls Arun.

Arun catches a guy, but the guy is killed in a car accident and Arun's higher officials are after him to find the killer. When Arun is about to crack the case, he is shot and killed by the goons. CBI officer Chandrakanth is desperate to know about the killer, where they transfer Arun's memory to Shankar with Sara's help, knowing that Arun's memory will remove his past. Shankar wakes up and experiences memories that aren't his own. He gets enraged when Sara reveals the truth to him and realizes that he will forget Chandni in a few days.

Shankar experiences brief flashes where he becomes Arun, but reverts to being Shankar. Shankar finds Arun's house and discovers a bag that has evidences about the murderer, where he calls the Chandrakanth to meet him in Goa. When Arun is about to reveal the identity of the murderers, he reverts to Shankar and beats all the cops and takes Sara at knife-point, where he escapes. After a few events, Shankar reverts to Arun and reveals to Chandrakanth that Kasi Vishwanath's son Devendra and brother-in-law Central Minister Ramamurthy are the masterminds behind the assassination.

With the help of Chandrakanth, Shankar devises a plan to arrest Devendra and Ramamurthy with the evidence in Benaras. Devendra gets exposed and escapes, where Arun follows him, but Devendra and his men continuously beat Arun in his head, which results in Arun getting reverted to Shankar. Sara tells Shankar that Devendra is responsible for Chandni's death. After an intense fight, Shankar kills Devendra, thus avenging Chandini's death. Sara and Arun/Shankar leave for Hong Kong on vacation, where Arun/Shankar proposes to Sara, who happily agrees. Arun reverts to Shankar