In 1975, a low-level party cadre Sengalvarayan [Thambi Ramaiah] erupts with unwavering loyalty to his regional leader Tamizhvanan and the party, so much so that he rushes to a meeting just as his wife goes into labor. In a twist of fate, Tamizhvanan arrives in Sengalvarayan’s area and lends his car to take Sengalvarayan’s wife to the labour ward, but the delivery happens safely inside the car, marking the first threads of a long, intertwined fate.
Jumping ahead to 1990, Sengalvarayan’s son Pazhani earns the top marks in his 10th standard state exam and seeks a blessing from Tamizhvanan, who now stands as the party chairman within the ruling coalition. Waiting in the party office for the leader, they witness a brutal, caste‑tinged killing of a rebel by Tamizhvanan. When Tamizhvanan asks Sengalvarayan to shoulder the blame, Pazhani steps forward, offering to accept prison time in exchange for an MLA seat for his father in the upcoming by‑elections. The gesture sets in motion a political ascent, and Sengalvarayan ultimately rises to MLA, shaping the power dynamics that will haunt the years to come.
By 2015, a group of trainee IPS officers—Mithran [Ravi Mohan], Shakthi [Ganesh Venkatraman], Suraj [Harish Uthaman], Kathiresan [Sricharan], and Janardhan [Rahul Madhav]—work covertly with the police to foil a kidnapping ring that targets four young women. One evening, Mithran receives a cryptic text from an anonymous number, and that night the team meets Mahima [Nayanthara], a forensic pathologist and Mithran’s former partner. The encounter reveals a broader pattern of corruption and crime, shaking Mithran’s belief in the system.
Soon they confront a chilling murder: a social activist named Raman [Junior Balaiah] is killed under suspicious circumstances, a crime tied to a more extensive network that uses legal channels to profit from crime. Mithran and his colleagues manage to arrest the gang and hand their leader to the authorities, but the political landscape remains volatile. Four days later, the gang’s leader walks into the IPS headquarters with the Home minister, a stark reminder of how deeply embedded influence can bend justice.
As Mithran digs deeper, he uncovers a startling link: Siddharth Abhimanyu [Arvind Swamy], a highly placed scientist, collaborates with three powerful patrons—Ashok Pandian, a pharmaceutical magnate; Charles Chelladurai, a mineral magnate; and the formidable Perumal Swamy [Madhusudhan Rao], a political heavyweight who now holds sway as Health Minister under a minority government led by Tamizhvanan. The trail widens to Siddharth’s secret medical experiments and the misuse of medicines for profit, drawing in Angelina, a Swiss pharmaceutical executive who champions affordable generics for life‑threatening diseases (though her exact fate in the plot becomes a turning point that mirrors the broader ethics at stake). Siddharth’s assassin kills Angelina before a pivotal agreement can be signed, and Mithran is also targeted with a gunshot.
While Mithran recovers in the hospital, Siddharth deploys an electronic bug—GPS and audio transmitters—hidden during his surgery to monitor Mithran’s every move. The bug begins to reveal Siddharth’s wider scheme and the hidden faces of power backing him. The case grows more concrete when Manimekalai [Abhinaya], a scientist from Siddharth’s lab who discovered a seaweed-based diabetes cure, records crucial evidence on an SD card before she is killed by Siddharth’s agents. The search to recover the card intensifies, and Siddharth assigns Vicky [Vamsi Krishna], Perumal Swamy’s brother, to retrieve it. Mithran enlists Jana to retrieve the card, but Siddharth’s forces overpower them; Jana is killed in the struggle.
Back at Mithran’s home, a concerning pin bearing Ananya’s image—Miss World 2011 and a confidante of Siddharth—raises suspicions that Siddharth himself may have orchestrated events at Mithran’s premises. Mahima scrutinizes the fingerprints on the pin and matches them to a gun case from Mithran’s early posting ceremony, uncovering a flashback: Siddharth killed Shilpa’s father to prevent her from attending the funeral, a move that secures Shilpa [Mugdha Godse] as an ally in his larger plan.
Mithran ultimately locates and removes the bug, captures Vicky, and manipulates Siddharth into killing him. Simultaneously, a medical report is altered to reveal favorable contracts for public welfare while accusing Tamizhvanan in the process. Facing political pressure, Sengalvarayan is forced to resign or be dismissed. Mithran pleads for permission to arrest Siddharth, and a dramatic confrontation unfolds at Sengalvarayan’s state funeral, where Siddharth’s schemes appear on the verge of collapse. Tahmlovar—the political machinery—seems ready to seize control, but Mithran’s pursuit persists.
The arrest of Siddharth reveals that the medicine in question had been patented in Manimekalai’s name, a move that would have allowed the drugs to be sold as generic rather than under patent protection. It is also revealed that Sengalvarayan is alive, saved by Mithran and his team, and that the public funeral previously staged was in fact for Jana. In a tense denouement, Mithran proposes a dangerous deal: he will save Siddharth’s life in exchange for full cooperation and evidence against his allies, even providing a bulletproof vest to fake Siddharth’s death during transport to court. Siddharth reveals one last detail before his supposed demise: the critical SD card remains hidden within the vest, containing damning evidence not for the nation but for Mithran’s own continued quest for truth.
In this intricate web of loyalties, power, and reform, the film threads together personal histories with a broader critique of organized crime and political complicity, leaving the audience with a tense meditation on justice, sacrifice, and the costs of uncovering truth in a system where influence runs deep.
