David Billa is a crime boss featured on Interpol's criminal list, who is hiding and operating out of Malaysia. DSP Jayaprakash has spent the last few years looking for Billa, leaving behind a life in India. During a chase with the police, Billa is severely wounded after an accident and dies in front of Jayaprakash, who secretly holds a burial of Billa. Interpol officer Gokulnath is assigned to work with Jayaprakash to capture elusive Billa as no-one knows of Billa's death. Jayaprakash keeps Billa's death as a secret even from his fellow officers, and tracks down a look-alike called Saravana Venu, a hotel server and small-time petty thief. He asks Venu to infiltrate Billa's gang by pretending to be Billa. In return, he will make sure that the child Venu adopted, Karan gets a proper education.

Jayaprakash trains Venu and sends him back to Billa's gang, disguised as an amnesiac Billa, who had been hiding at an apartment complex due to his injuries. Slowly, Venu starts to learn about Billa's gang and even speaks to Jagdish, Billa's boss on the phone. Venu provides a pen drive with the secret information of the crime network to Jayaprakash, but he is about to be killed by Sasha because her brother Rajesh as well as his fiancée Rhea were killed by Billa earlier. At this juncture, Jayaprakash arrives and tells her that he is Venu and not Billa. Later before a party, Venu secretly provides information to Jayaprakash about a meeting of Billa's network and C.J., Billa's girlfriend, overhears his conversation. She confronts Venu, but in the struggle, he accidentally kills her.

A shootout occurs at the party, and Jayaprakash is killed by Jagdish, leaving his gun behind. Venu finds the Jayaprakash dead and the gun, but is taken into the custody of the police team, now headed by Gokulnath. He argues during interrogation that he is Venu and not Billa to Gokulnath. Venu mentions a piece of evidence – the pen drive, which may prove his innocence, but the pen drive is nowhere to be found. Unable to prove his innocence, Venu escapes from a police van and phones Gokulnath, where he asks him to meet at the Aero bridge, where it is revealed that Gokulnath is none other than Jagdish and was the one who killed Jayaprakash. Officer Anil Menon apparently had the pen drive all along and strikes a deal with Venu to get hold of Jagdish.

Meanwhile, Sasha and Karan have been kidnapped by Jagdish and wants the pen drive in return for them. Venu meets Ranjith and gives him a second pen drive with the same data, but corrupted. When Ranjith tries to kill Venu, a scuffle ensues, making Ranjith fall from the top. In a final confrontation, Jagdish fights with Venu. Jagdish posing as Gokulnath, asks the police to arrest Venu as Billa but gets shot by the squad of police and dies as the police have wired the entire conversation between Jagdish and Venu, thus proving his innocence. Venu finally hands over the original pen drive to Officer Menon and joins Sasha and Karan.