Unnaipol Oruvan

The film opens with Govindan Raghavan Maarar, recently removed from his post, reflecting on his termination. He hints at a mysterious outsider who has disrupted the city’s security. The voice-over establishes a theme of insecurity and public mistrust.

A nameless man strategically places a travel bag at Chennai Central railway station, signaling the start of a city-wide threat. The act is quiet and methodical, revealing his intent without immediate confrontation. The bag becomes a focal point for investigators.

The same man plants another bag under the pretense of lodging an FIR, stashing it in the toilet of the Anna Salai police station. His actions show calculated misdirection and an aim to stress the police infrastructure. The location later becomes a scene of imminent danger.

The man ascends to the rooftop of an under-construction building and establishes a base with gadgets and surveillance equipment. This elevated vantage point allows him to monitor city activity and coordinate his next moves. Security forces begin to sense an elusive, high-tech threat.

The caller informs the Commissioner that five bombs have been planted citywide, programmed to explode simultaneously within four hours. The threat triggers a high-priority mobilization of intelligence and surveillance resources. Officials scramble to locate the caller before the time runs out.

The caller tips off journalist Natasha Rajkumar and directs her to the Anna Salai police station. The media presence adds pressure on authorities and increases the urgency of the investigation. The Commissioner debates how to involve the press while maintaining control.

The bomb disposal squad locates a device at the Anna Salai police station and begins defusing it. With only about three minutes to spare, the operation tests the team's nerves and technical capabilities. Natasha reports live from the scene, heightening the drama.

A debate erupts over who should negotiate with the caller. The chief secretary appoints the Commissioner as the State’s negotiator, granting him near-unrestricted authority for a few hours. The stakes rise as the caller presses philosophical and religious questions.

The caller uses advanced software to rotate mobile numbers and locations every minute, evading conventional tracing methods. To counter this, investigators enlist a young IIT dropout hacker. The cat-and-mouse game becomes a focal point of the investigation.

With help from a police officer, investigators assemble a facial composite of the caller, but the identity remains elusive for a long time. The delay underscores the caller’s ability to stay hidden and the strain on resources.

Commissioner agrees to hand over four terrorists at the Sholavaram airstrip to flush out the caller’s network. Arif Khan and Sethuraman are placed in charge of escort and custody arrangements as part of the operation.

At the handover, the caller confirms the identities via a conference call. Abdullah is separated from three others; during the staged exchange, a car explodes killing the other three terrorists. Abdullah survives, validating the caller’s deception.

Arif decides to take Abdullah away, disobeying orders. A car bombing kills the others while Abdullah remains alive. In a tense confrontation, Arif ultimately shoots Abdullah, and Sethu shoots Arif to fake a self-defense incident.

The caller reveals there are no more bombs, exposing the fragility of urban security and the immediate need for justice. The IIT hacker is pressured to reveal details but refuses, complicating the chase.

The Commissioner traces the caller’s location; the caller destroys gadgets with a bomb and attempts to escape. In a final pursuit, the Commissioner catches up and they shake hands, with a voiceover reflecting on the ambiguous moral of the events and the price of security.