Inaindha Kaigal

Ashok reaches Chennai pursued by thugs and is stabbed, collapsing in a church. Julie, an orphan who finds him, helps get him admitted to a hospital. The incident triggers a chain of events that draws in other key characters.

Two men disguised as doctors enter Ashok's hospital room and kill him. Before dying, he scribbles IC181 on a lamp, leaving a cryptic clue. The killing reveals a wider conspiracy behind the assault.

Army Doctor Chandralekha, under house arrest for alleged treason, visits Ashok's bedside and finds the IC181 note. She realizes it points to someone connected to Ashok’s final days. The clue sets off a pursuit to identify the mysterious ex-soldier named David.

A lawyer identifies IC181 as the service number of an ex-military man named David. This revelation ties the note to Ashok's past mission and signals that David may still be active. The search for David becomes central to the plot.

Ashok and David had previously worked on a covert mission to infiltrate an enemy prison base and succeeded. The mission's heavy casualties led to the team being disbanded and David quitting the service. The backstory explains David's re-entry into danger.

David and Julie are lovers, a personal bond that endures amid the turmoil. Julie later learns she is pregnant, which adds emotional stakes to the unfolding events. Their relationship provides a human dimension to the mission.

David meets Chandralekha secretly and learns that Ashok was released from military prison and had seen her son Gunasekaran imprisoned on false charges. Chandralekha requests David to rescue Gunasekaran, and he agrees out of patriotism. The mission shifts from personal history to a direct rescue effort.

PK Roy, a ruthless criminal, appoints Pratap to bring Gunasekaran out of prison. Pratap is clever and ambitious, and his mission intersects with David's. During the course of the pursuit, Pratap falls in love with a girl, adding a personal complication.

Julie participates in a social service program but leaves after learning she is pregnant. She spots David and is briefly rescued by him from gangsters, though he fails to recognize her. Eventually, Julie travels to Chennai with a caretaker.

David and Pratap cross paths on the mission and decide to team up to rescue Gunasekaran. They acknowledge their different motives but recognize the greater danger they face. The unlikely partnership becomes central to the plan.

Gunasekaran, a photographer with access to military life, witnesses a helicopter blast and documents it. PK Roy overhears Gunasekaran’s findings and pursues him. Gunasekaran buries the black-box and is eventually captured by the enemy.

Back in Chennai, PK Roy arrives at the Central Station intent on killing Pratap and Gunasekaran and retrieving the black-box. A fierce confrontation leaves David wounded. Pratap defeats PK Roy by chaining him to a moving train, causing him to be dragged and hanged from a bridge.

Julie dies while giving birth to a son, an abrupt and devastating turn. David dies soon after, unable to hold his newborn or reconnect with Julie. Their deaths seal the tragedy at the heart of the mission.

Prathap takes the newborn and entrusts him to his girlfriend to raise until his release. The two men become guardians of the child born to David and Julie, symbolizing a fragile future built from the mission's sacrifices. The ending leaves the child’s fate open, but the bond forged through struggle remains.