Based upon the human rights violations by the police and the prison authorities in India during the emergency of 1975–1977, the film tells the story of Unnikrishnan, an ex-convict. Recently released from prison, Unnikrishnan relays his life story to fellow passengers on a bus. He tells of his orphan upbringing, career as a forest official, and love for a young woman named Thulasi, whom he promised he'd marry, before he was erroneously arrested for a crime he did not commit.

Based upon the human rights violations by the police and the prison authorities in India during the emergency of 1975–1977, the film tells the story of Unnikrishnan, an ex-convict. Recently released from prison, Unnikrishnan relays his life story to fellow passengers on a bus. He tells of his orphan upbringing, career as a forest official, and love for a young woman named Thulasi, whom he promised he'd marry, before he was erroneously arrested for a crime he did not commit.