A group of college girls arrives at the Chola Picnic Village in a light blue matador, checking into a hotel that opens onto a scenic picnic spot. At night, they wander to the beach for a bonfire, singing and dancing under the stars. Among them, Vasanthi [Disco Shanti] ducks away from the crowd, discovers a pi-shaped bell stand, and rings it three times. In response, a menacing figure, P.R.K [Ravichandran], appears riding a carriage, drags her by the hair, and abducts her into the darkness, setting a chilling tone for what follows.
The scene shifts to Raja [Vagai Chandrasekar], who enters the picnic village, photographs the pi-shaped bell stand, and notices a beldam seated beneath it. He continues his wandering and encounters a priest, later presenting himself as the Assistant Editor for the Dhinamurasu Magazine. He raises a troubling question about a girl’s body found on the village beach four to five days earlier, a death the police have ruled as suicide. The priest refuses to answer, and Raja captures another image before moving on. Soon Lakshmana, the younger brother of P.R.K, appears, smoking a cigarette, and Raja quietly leaves the area.
Chandran, the editor of the magazine, teams up with Raja to develop the photographs. Chandran questions how Raja is obtaining such sensational access, and Raja explains that he has a source inside the suspect’s circle. The key person is Uma, a stenographer who is connected to the house of MLA Sattanathan [Malaysia Vasudevan], the principal suspect. Uma overhears a phone call at the MLA’s residence; P.R.K wants to speak with the MLA, and Uma answers, overhearing plans about the Picnic Village investigation and a promise to “take care of it.” The tension tightens as the stakes rise and the web of involvement expands.
The next morning, the newsroom is abuzz when an inspector calls to question why the newspaper is pursuing the story. Chandran stands his ground, insisting on reporting what they know. Vijay [Vijayakanth], a friend of Raja, joins the magazine, and the duo, along with the editor, decide to stay in Devi’s house for rent. Raja brings Uma’s blind father to live there, and Devi [Kokila] is present as well. Devi and Raja share a complicated relationship with Uma; Devi and Vijay are involved with each other, just as Raja is involved with Uma. The narrative threads weave through personal loyalties as the investigation intensifies.
On Uma’s birthday, tragedy strikes: she is killed by MLA Sattanathan in a horrific public act witnessed by Raja. The case is handed over to DSP Deenathayalan [Vijayakanth], signaling a formal turn in the pursuit of justice and justice-seeking eyes.
Meanwhile, a newly married couple, Ramesh [Karthik Muthuraman] and Shanthi [Rajani], honeymoon at the same village. Their happiness is shadowed by watchers in the shadows—the “beldam” presence in the background—until danger erupts. After the Maamarathu poo song ends, night unfolds and P.R.K arrives, rendering Karthik Muthuraman unconscious. Shanthi manages a perilous escape with the help of a passerby, whose car stalls on the road. He ferries her to a hospital, and Raja arrives at the scene. One of Sattanathan’s men follows, attempting to finish Shanthi off, but the intruder is thwarted at the last moment when Raja intervenes, only to be stabbed by the attacker. Raja counters, defeats the assailant, and carries Shanthi to DSP’s house, where he dies in the process, leaving Vijay and Peter—along with Ramesh—to piece together the motive.
As the narrative unfolds, Peter, Ramesh, and Vijay unite to uncover why P.R.K launches these attacks. P.R.K then traps everyone, revealing the core motive: he once loved someone whose eyes captivated him, but she betrayed him, driving him to seek eyes from the girls he encounters. The truth about the Bel dam becomes clear—she is his stepmother, feeding him information about the girls. With this revelation, DSP Deenathayalan acts to punish the culprits and restore a sense of order.
In the end, Ramesh and Shanthi find a way to reunite, offering a glimmer of resolution after a harrowing sequence of events. The story closes with a somber note on the consequences of obsession, the fragility of trust, and the costs paid by those who chase truth in the shadow of a dangerous conspiracy.
