Sahadevan is a simple, earnest village auto-rickshaw driver whose lifelong ambition is to join the police force as a Central Investigation Department (CID) officer. However, his aspirations are continually thwarted by his father, a disgruntled retired constable who resents the
police department, and the local Circle Inspector, who harbors a deep personal grudge against Sahadevan. Despite these overwhelming familial and professional obstacles, Sahadevan refuses to abandon his dream. He establishes a comical, self-styled private
detective agency with his loyal friends, Karunan and Haripad, determined to prove his investigative prowess to the skeptical authorities.Sahadevan’s life takes a dramatic turn when he falls deeply in love with Meena, the daughter of the wealthy and influential politician and Home Minister, Viswanathan. Meena reciprocates his feelings, but their romance faces a massive hurdle due to the vast disparity in their social standing. Compounding this personal turmoil, Viswanathan is secretly involved in a massive, high-stakes international conspiracy. Along with a ruthless corporate syndicate, the corrupt minister plans to smuggle radioactive material and execute a devastating terrorist attack within the state to destabilize the government and seize ultimate power.While investigating a seemingly minor local nuisance, Sahadevan and his bumbling friends stumble upon the syndicate’s secret underground lair. They accidentally record crucial video evidence detailing the terrorists' elaborate plot and Viswanathan’s treasonous involvement. Recognizing the immense danger, the syndicate frames Sahadevan for a series of violent crimes, including bomb blasts and police assassinations. Declared a public enemy and a fugitive, Sahadevan is hunted relentlessly by the entire state police force, including his own exasperated uncle.Driven by his desire to clear his name, save the state from catastrophe, and win the approval of Meena’s family, Sahadevan goes into deep hiding. Utilizing disguises, sheer luck, and unexpected help from a trained police dog named Don, Sahadevan outsmarts the syndicate at every turn. He manages to kidnap the lead scientist of the operation, extracting the access codes needed to disarm the explosives. In a high-octane climax set at an abandoned industrial warehouse, Sahadevan confronts Viswanathan and the lead terrorist just moments before the bomb is set to detonate. In a display of unexpected bravery and sharp intellect, Sahadevan disables the device, rescues Meena, and captures the conspirators. Vindicated by his heroic actions and undeniable proof of his competence, Sahadevan is finally offered an official, prestigious position within the CID, ultimately securing both his dream career and the hand of the woman he loves.