The story revolves around the clash between Ayyappan, a senior police officer who serves at the Attappadi Police Station and Havildar Koshi, who comes to the village with a motive.
Ravi, a critic, comes across the writings of K T N Kottoor. Highly inspired by what he reads, he travels to a village in Kerala in search of the author.
Set in the rural socio-political environment of North Malabar, Kotthu follows two party workers Shanu and Sumesh and how certain party workers are honour-bound to their `acquired` political ideology of revenge killing.