Aravind Karunakaran a sub-inspector, along with his colleagues and superior, Deputy Superintendent Ajith Karunakaran, who is also his brother, arrest a man named Murali, who they are convinced was a murderer they were looking for, forging evidences against him. However, they discover to their shock soon after that the real murderer was someone else. While Ajith and the others are in solidarity over keeping silence about their misconduct, lest they risk their careers, Aravind retires from the force after refusing to be a part of the charade and getting condemned by his colleagues for the same. A few years later, when Aravind returns to his hometown for his niece's wedding, he discovers certain leads that can lead him to the actual culprit, thereby saving Murali. Aravind then rejoins the force and begins to conduct the investigation on his own time, narrowing on a potential serial killer and identity thief who has been behind several murders around Kerala over the years using fake identities, while his brother and his accomplices continue to sabotage his plans by transferring him to the Kasaragod branch only to find out that Aravind was getting closer and closer to the culprit. However by the time Aravind tracks down his house, he finds out that the culprit died in a car accident while using another fake identity and his face is deformed. He nevertheless uses this in order to free Murali while Aravind, Ajith, Pramod and Alex are all suspended. The movie ends with Aravind reading the culprit's letter which acknowledges Aravind's findings but after reading the date of the stamp he realizes that the letter was written before the day the culprit died.



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