C.I. Mahadevan 5 Adi 4 Inchu movie tells an explosion in the town is a creation of terrorists who are hand in glove with the minister. To save his face the minister gives the investigation charge to Inspector Mahadevan (Cochin Haneefa) who is a bumbling idiot and a movie crazy fan. He has Head Constable Salgunan (Jagathy Sreekumar) and Constable Dasappan (Harisri Ashokan) for company. Solving the case forms the story.