Pathu Thala

Tamil Nadu CM Arunmozhi Raja is mysteriously summoned at night and subsequently disappears, triggering investigations. Deputy CM Naanjilar Gunasekaran, a political rival, plays a key role in the events surrounding the disappearance.

The CBI begins probing Ameer, a henchman of crime boss AGR Raavanan, due to his connections to the case. Ameer is surrounded by police but chooses to commit suicide rather than surrender, highlighting the dangerous world he inhabits.

Sakthivel, an undercover CBI officer, is assigned to infiltrate the crime syndicate under the alias Guna. His mission is to gather evidence against AGR Raavanan, a powerful crime boss controlling illegal activities.

Guna begins working for crime boss Kareem Bhai, but after an incident, he is reassigned to work for AGR Raavanan. During this period, he encounters and clashes with AGR's trusted henchman, Selvin.

Guna reconnects with his ex-girlfriend Leela Thompson, a Tahsildar working to thwart AGR's illegal sand mining operations. Their meetings reveal her resistance to AGR's corrupt influence.

Guna earns AGR's trust after he successfully retrieves ₹400 crores from a goods train, demonstrating his capability to handle high-stakes criminal activities under the radar of the CVC team.

During a contested by-election, Naanjilar persuades Ruby Fernandez, a criminal leader, to run against AGR's candidate by protesting illegal activities. The protest leads to violence and destruction, escalating tensions.

Protesters set fire to an old age home called Nesakaram, which AGR is implicated in supporting illegally. In retaliation, AGR brutalizes and beheads Ruby, escalating the violence and revenge cycle.

Frustrated with AGR's dominance, Leela decides to contest in the by-election herself, aiming to oppose his illegal activities and bring change through political participation.

Guna finally meets AGR after surviving an assassination attempt orchestrated by Naanjilar. AGR reveals that Arunmozhi’s wife, Samudra, is his sister, and she and her daughter Aradhana reside with him, revealing complex family ties.

AGR threatens Naanjilar with violence, leading Naanjilar to vow to kill AGR, intensifying their rivalry amidst ongoing political and criminal conflicts.

As the election campaign progresses, Selvin, an AGR associate, suspects Guna is a mole after seeing him with Leela. He finds evidence in Guna's residence linking him to the crime syndicate.

Selvin is gunned down after uncovering evidence against Guna, causing suspicions to fall on Guna before AGR intervenes to clear his name. This solidifies Guna's dangerous undercover role.

AGR kills Sabari, his business manager and the mole, after discovering his treachery. Guna witnesses the killing and learns about AGR’s involvement in Arunmozhi’s murder and illegal enterprises.

AGR reveals to Guna his knowledge of Guna's true identity and their familial ties. Naanjilar arrives for a final showdown, resulting in multiple deaths, including Singha and Naanjilar. The next day, AGR is arrested based on his confession, but later released due to lack of evidence.