Venu

When C.I.D. Chandran (Raghavan) is killed by a masked attacker, Central Intelligence Bureau (CIB) appoints C.I.D. Nazir (Prem Nazir), along with assistant Bhasi (Adoor Bhasi), to find the group behind the killing & bring them to justice.

Two petty thieves, Pachan (Jagathi Sreekumar) & Paramu (Sreenivasan) finally strike big, but Pachan gives Paramu the slip & runs away with the money. Pachan swindles more money from a rich businessman Purushothaman (Rajan P. Dev), by pretending to be in love with his invalid daughter Manisha (Sreeja), but Paramu steals the loot from Pachan this time. With the new-found cash base, Paramu sets out to swindle rich heiress Neena (Kavya Madhavan) & her father.

Anjali Arackal (Aparna Gopinath), a freelance journalist looking for a break, comes across C.K. Raghavan (Mammootty), a mild-mannered prisoner who had been in jail for 20 years for a double homicide, something which Raghavan denies committing. Anjali publishes his brilliant musings in an article which brings her fame & a book offer. As Raghavan is released, Anjali hides him away & tries to get him to write the material for the book. Raghavan, feeling trapped, experiences writer's block.