Director: H. Vinoth
The movie starts with Sasi converting the manuscripts of criminal cases into digital formats. In the process, he comes across an old spine-chilling dacoity murder case. Sasi immediately calls the police officer who was in charge of that case, Dheeraj (Karthi). The story then goes into a flashback in the year 1999 where Dheeraj is undergoing the training to be posted as DSP of Tamil Nadu Public Service Commission. Simultaneously, a group of dacoits barge in a house along the highway of Tamil Nadu, kill all the people and take all the belongings. Theeran returns to his hometown and falls in love with Priya (Rakul Preet Singh), his new neighbour. Later, the duo gets married. Soon Theeran becomes known in the police department for his different way of handling cases. Theeran is then moved to Ponneri after a dacoity attack. Theeran along with Police Inspector Satya (Bose Venkat) starts handling the case but lead nowhere. Later in 2003, they both form a group of police officers to go around India to identify the fingerprints of the dacoits.
Later, the case is put on hold because of the carelessness of their senior officers. The dacoits raid again in 2003 in the house of an MLA and kill him. The government under heavy pressure allows Theeran and his team to catch the dacoits. A year later one fingerprint is matched in Uttar Pradesh in a lorry station. But they fail to capture them and eventually, the dacoits raid Sathya's house, kill his wife and leave Priya injured and in a coma. Will Theeran be able to capture the dacoits, is a thing to watch the rest of the movie!