The film explores the dark underbelly of Thiruvananthapuram where rival goondas clash in cold-blooded gang wars to gain dominion over the city's suburbs and slums.
Set in the village areas of Wayanad, Malappuram and Kannur, Kappela revolves around an ordinary, innocent girl who comes to Kozhikode city from a high range area called Poovarmala.
A young couple working are out on a drive where they meet with an accident. It leaves them in a triangle between a cop who investigates the accident and the corrupt political hegemony who are in pursuit of them.
A small town couple, Sethu and Megha, plan to elope, but complications arise when Sethu's sister also decides to elope. Sethu and his quarrelling uncles must bring her back while trying to elope with Megha without getting caught.