FIR is a situational comedy serial revolving around a haryanvi police officer named Chandramukhi Chautala and her two subordinates, head constable Gopinath Gandothra and constable Billu. The show depicts their lives as they try to solve every case which comes to Imaan Chowki .
New cases come to the police station in every episode. An individual or a group come with a complaint or a problem. The problem generally has nothing to do with police. It may be a case of love, divorce, snoring, or bad cooking. Chandramukhi Chautala and her constables solve the case successfully.