Selvam (
Bobby Simha) is an honest police officer. His senior, O. Nagarajan, assigns him an unofficial task: tapping the phones of several VIPs, who are Nagarajan’s political rivals, in hopes of finding scandals to bring them down. Over time, Selvam becomes corrupt. He begins using his position to tap the phones of other VIPs, extorting large sums of money. One day, while monitoring the phone of a VIP’s wife, Selvam discovers she is having an affair with her
Facebook friend. Out of curiosity, he taps the man’s phone as well—only to be shocked when he learns that his own wife, Agalya (
Amala Paul), who is addicted to Facebook, is also seemingly involved with the same man. Enraged but afraid that revealing his surveillance would destroy their marriage, Selvam continues spying on Agalya and her supposed lover. With the help of private detective Ganesh (
Susi Ganeshan), Selvam identifies the man as Balakrishnan, or Balki (
Prasanna). A former computer engineer, Balki now targets married women on Facebook. He carefully studies each victim, pretends to be their ideal partner, and lures them into relationships. Once they are trapped, he demands money and sex. Many women who took him seriously even tried to divorce their husbands for him, only to be abandoned—some later committing suicide. Determined to protect his wife, Selvam hires thugs to rough up Balki, warning him to stay away from Agalya. But Balki persists, continuing to contact her. Furious, Selvam personally confronts Balki, beats him, arrests him, and threatens to kill him. Balki then reveals that after Selvam’s men assaulted him, he hacked into Selvam’s computer and uncovered all of his secrets—illegal surveillance of VIPs and his ransom earnings. Balki threatens to expose everything, forcing Selvam to release him. Meanwhile, Agalya confides in her friend Mathy (
Soundararaja), unaware that Selvam is tapping the call. She reveals she never had an affair with Balki—she only saw him as a friend. When Balki began crossing boundaries, she blocked him, but he retaliated by threatening to leak their chats out of context to ruin her reputation. Now demanding sex, Balki pressures Agalya to meet him at his house. Reluctantly, she agrees, but asks Mathy to wait outside and intervene if she doesn’t emerge within five minutes. Balki indeed tries to force himself on her, but Mathy rescues her just in time. When Selvam learns what happened, he is enraged and vows to kill Balki. But Balki shows him a secret shower video of Agalya, captured with a hidden camera inside a gift he gave her. He threatens to release it if Selvam harms him. Helpless again, Selvam retreats. Later, he sneaks into Balki’s house to delete the video but fails. Balki, provoked, demands Selvam divorce Agalya. Desperate, Selvam takes leave from work and takes Agalya abroad. There, he proposes resigning from the police force and buying the resort where they are staying so they can settle there. Agalya agrees. But Balki calls, demanding Selvam’s decision. Pretending to accept, Selvam lures Balki to the resort. While Selvam is away, Balki tries to assault Agalya—but suddenly collapses. A flashback reveals Selvam had informed Balki’s estranged father about his son’s crimes. The father, siding with Selvam, secretly poisoned Balki’s food over time, leaving him near-vegetative. Selvam arrives, uses Balki’s biometric data to access his online archive of blackmail material, and deletes everything. He then returns the incapacitated Balki to his father. Selvam reconciles with Agalya, each silently aware of the other’s ordeal but choosing to keep it unspoken. Back in India, however, Selvam learns that his accomplice who managed his laundered money has died—leaving him with no access to his illicit fortune and shattering his dreams of a peaceful new life with Agalya abroad. ==Cast==