Kerala Police is about C I Sathyanath (Mani) who is an honest cop, does not take recommendations and is courageous with his find of convicts. However, he hails from a backward class and is always looked down upon by his colleagues Mukunda Varma (Baiju) and Venugopal who hog the limelight and credit for Sathya's deeds. He gets into the wrong books of seniors for his honesty but then his only guardian angel is the Superintendent of Police Philip Tharakan (Innocent) who protects him all the time.
Meanwhile, Sathyanath is assigned the task of investigating the murder of Goa based freelance photographer Bimal Roy in the tile factory and his tactical approach leads him to the door of Sanjana (Lekshmy Sharma). He starts to work on it intensely and in no time Sajana confesses to the crime but then the police instinct of Sathyan tells him that she may not be the only one after all and decides not to arrest her. The case gets passed to CBI and a special team led by Nandini Verma (Swarnamalya) comes into the investigation.
Nandini is very repulsive to the way the police force works and this leads to an altercation between Sathyan and Nandini from the onset. With things not getting anywhere, Sathyan goes on leave and with the help of his trusted constable Balram he gets into a personal investigation on this case. What happens in the end? Who is the killer? Who gets the killer? All this forms the rest of the story.