Change is coming to the tranquil town of Karuthupuzha, nestled deep within the lush Kerala countryside. The mighty black river, after which the town is named, is now no more than a trickle. People have begun to listen to weather forecasts on the radio rather than looking out of the window to see if it's going to rain. The jackfruit tree in the middle of town has suddenly started fruiting. And, most seismic of all, Paachu Yemaan, the Inspector of Police, who has terrorized the town for decades has retired. Desperate to find him something to do, his wife, Sharada, and the good-hearted Barber Sureshan decide that ex-Inspector Paachu's post retirement project will be the reforming of the town drunk, Joby. What the two good Samaritans haven't counted on is the chain of extraordinary events that their project is about to set in motion.