Ayan

Deva, a computer science post-graduate in Chennai, works with Dass smuggling pre-release unlicensed films on DVD and other contraband. Their operation relies on air routes and covert networks, and Deva's widowed mother Kaveri strongly disapproves of his chosen career.

Kamalesh orchestrates a raid on their hideout to disrupt the piracy operation and tries to pin the crimes on one of Dass's men. When Deva volunteers to take the fall, Chitti Babu steps forward and accepts responsibility. This act leads Chitti to join Dass's crew and soon he befriends Deva.

Chitti joins Dass's group and befriends Deva while continuing his education. For months, they run smuggling jobs together and Chitti learns the various means and modes of operation.

During this period, Deva accidentally meets Chitti's younger sister Yamuna and they quickly fall in love. The romance blossoms amid the dangerous world of drug and film smuggling.

On Deva's birthday, he and Chitti smuggle gold bars worth $150 million from a tanker at Chennai port. Dass gives him money and the day off to celebrate, while Chitti's crew continues the operation. A temple worship visit later leads to a police tip-off that endangers the hideout, and they narrowly escape.

Deva discovers Chitti has been working for Kamalesh all along and that Chitti has become a drug mule, transporting heroin capsules to Malaysia. He meets Deva on a flight, falls ill, and Deva fends off Kamalesh's gang to help him; Chitti then confesses that their friendship was genuine.

Kamalesh's gang kidnaps Chitti before Deva can intervene and cut him up to recover the drugs. Deva fights off the thugs and tries to save Chitti, who, in his final moments, asks Deva to burn him so his family never learns of his death.

Kamalesh tips off the authorities about Chitti's death, and Yamuna files a case against Deva. Yamuna later finds Chitti's phone, in which Chitti recorded the circumstances of his death, helping clear Deva. Deva is released and Yamuna reunites with him.

Even as Deva plans to step away from smuggling, Kamalesh has his men plant drugs at the airport and blame Deva. In response, Deva tips off customs officer Parthiban to protect himself. He then works with Parthiban to monitor Kamalesh's calls and bust many illegal consignments.

Deva and Parthiban track Kamalesh's communications and bust numerous smuggling consignments. Their efforts escalate Kamalesh's wrath and push the operation into a more dangerous confrontation.

Kamalesh discovers the bug and tries to eliminate Deva and Parthiban, but they escape again. They go on to secure a massive cocaine shipment from Kamalesh.

Deva records Kamalesh making sexual advances on the accountant's daughter Kavitha, prompting the accountant to agree to testify against Kamalesh. Kamalesh retaliates by killing the accountant before the court hearing, and he is released due to lack of evidence.

Kamalesh plans to kill Deva and his mother and targets Dass as well. Dass saves Deva, but dies after his vehicle collides with a petroleum tanker.

Deva heads to Congo, where he defeats Kamalesh and retrieves the diamonds. The mission marks a turning point and ends Kamalesh's operation.

On returning to India, Parthiban confronts Deva and reveals that Deva's mother exposed him to illegal activities to get Deva out. Deva surrenders the diamonds hidden under a wig and accepts Parthiban's offer to enlist him as a customs official. He walks out with his mother and Yamuna, beginning a new, lawful life.