Padmanabhan reunites with his son after many years of separation, but his happiness is short-lived when he realises that his son is mentally ill.

Samy and Karuna grow up together in the slums of Royapuram. One day, they witness the brutal murder of their teacher by a gangster. While Karuna manages to kill the gangster, Samy tells to the cops that Karuna was responsible for the murder.

A resident in Ooty named ‘Petition’ Pethuraj reopens a case from 2004 that involved a serial killer ‘Psycho Jyoti’ who was convicted for the kidnapping and murder. Venba, his daughter and a passionate lawyer, seeks to unveil the truth.

Roshagadu is an suspense thriller based movie in which, Chiru played the role of CID informer and Thyagaraju and Prabhakar are two gangleaders and CID officer Neelima(Madhavi) is assigned to burst their underworld.Neelima uses Sikander (Chiru), who works for them, as her informer, but before sikander manages to gather enough evidences, Prabhakar comes to know about his reality and kills him. Now, Neelima is left without any support in her mission.Oneday, she spots a Sikander look a like (chiru again) and persuades him to act like sikander, During this process, they fall in love with each other. In the end, sikander manages to liquidate all secret activities of thyagu and bhayankar and helps neelima in completing her mission.