Raatchasan (; ) is a 2018 Indian psychological crime thriller film directed by Ram Kumar. Basic structure and character of the film are based on two real personalities.The film features Vishnu Vishal, Amala Paul, and Saravanan while Kaali Venkat, Vinodhini Vaidyanathan, and Ramdoss play supporting roles. The film tells the story of an aspiring film director who becomes a police officer after his father's death and tries to track down a serial killer.

Plot

The corpse of Samyuktha, a 15-year-old student who was brutally murdered, is discovered. Arun Kumar is an aspiring filmmaker who wants to make a movie on psychopaths. After multiple rejections and pressure from his family, he becomes an Assistant Sub-Inspector of Police, with the help of his brother-in-law, Doss, a police officer himself. He moves in with his sister Kokila, Doss and their daughter Ammu. Ammu gets into trouble in school and asks Arun for help, so he meets her teacher Viji at school. He befriends Viji and her hearing and speech impaired niece, Kayal.