Parvathy is elated when she finds out that her brother, Saravanan, who has been missing for 15 years, is in Goa. However, somebody has already hatched a plan to kill him.
A sister, who has been leading a humdrum life for more than a decade after her younger brother runs away from home, becomes excited after the latter's return. However, their lives witness a roller-coaster ride when the brother faces life threat from an unexpected person.—Santhosh
A fight erupts between teenagers Saravanan and Manimaran, where Saravanan is hit on the head by Manimaran and faints. Manimaran is forced to escape, leaving the fainted Saravanan on top of a lorry.
15 years later: Gnanamoorthy is a politician in Mettupalayam, Coimbatore District, who lives with his wife Padma, daughter Parvathy, and wheelchair-bound mother. Parvathy spends her days in sorrow, hoping that her aggressive younger brother Saravanan, who had left home 15 years ago, will return. Her family believes that the miracle of him coming back may happen. One day, Moorthy receives a call from Jeevanand, who tells him that his long-lost son is found. In reality, "Saravanan" is Vicky, a trickster and tourist guide in Goa. Moorthy brings Vicky to his house, where Padma is overjoyed at seeing her son. However, Parvathy keeps shunning Vicky. Saravanan's childhood friend and lover, Sanjana, is also elated to reunite with "him".
Jeeva and Vicky had secretly planned for Vicky to pose as Saravanan for a while before stealing money from the house and escaping, after which they would share the bounty. Saravanan's friend Karan, who is a cop, doubts whether Vicky is actually Saravanan, which grows stronger when he asks Vicky about their childhood and he flounders. However, Parvathy stops Karan from trying to disprove Vicky/Saravanan since the joy in her family has come back upon his arrival anyway.
Meanwhile, it is revealed that Moorthy had in fact arranged for Jeeva to make Vicky pose as Saravanan. When Jeeva blackmails Moorthy for Rs. 2 crore (US $250,000), Moorthy kills him and pins the murder on Manimaaran, who is now a local politician where he wants to build a resort in the nearby village. Karan suspects Vicky is involved in the murder since he shows up at Jeeva's house trying remove evidence that he is a fraud. However, Karan doesn't find any proof tying Moorthy or Vicky to Jeeva's death and arrests Manimaaran. Moorthy had already entered the house once more and removed all the evidence.
While Vicky is driving, he is hit by a truck and narrowly escapes death. Another attack in the house confirms his suspicions that someone is trying to kill Saravanan and sets out to find out what really happened to him. After tracing Saravanan's steps that night, he finds the truck that hit him, and on interrogating the driver, learns that the perpetrator is Moorthy's right-hand man Sudhakar, who was angry that Saravanan had come back as he would lose the position of MLA to him.
Finally, with a clue from Sanjana, Vicky deduces that Saravanan had returned home the night of his disappearance - he was a drug addict who had fought with his family and was the reason for his grandmother's paralysis. He believes that out of anger over Saravanan hurting his grandmother, Moorthy had killed his son accidentally and used the sympathy to earn votes. On confronting him, Moorthy offers Vicky money to keep the matter quiet, but Vicky tells Padma, who is already aware of it. Suddenly, Parvathy holds Vicky at gunpoint and reveals what happened that night.
15 years back: After Saravanan had fought with Padma and Parvathy and pushed his grandmother down the stairs, they took his grandmother to the hospital. Meanwhile, Saravanan managed to escape after his fight with Manimaran and returned home on his bike. Moorthy and Parvathy came back to the house and found Saravanan getting high. In a fit of rage, Moorthy beat his son, but when Saravanan hit him back in a drug-fueled rage, Moorthy broke down. Parvathy tried to console her father and threw away her brother's drugs. Saravanan began choking her and in desperation, Parvathy grabbed a nearby showpiece and accidentally slit his throat. In order to save his family's reputation, Moorthy fabricated a story where Saravanan had run away. Saravanan's body was interred in the forest area where the resort is now proposed to be built.
Present: Shocked at the revelation, Vicky decides to leave the house. At the train station, Parvathy admits that she had come to accept Vicky as her brother. The film ends with Vicky/Saravanan and Parvathy driving back home.
