F.I.R. is a situational comedy serial centered on a Haryanvi female police officer named Chandramukhi Chautala and her three subordinates, Head Constable Gopinath Gandothra, Constable Mulayam Singh Gulgule and Constable Billu, who later joined the Chowki. The show depicted their lives as they try to solve every case which comes to their police station Imaan Chowki, Ravanpur. New cases come to the police station in every episode. An individual or a group comes with a complaint or a problem. Chandramukhi Chautala and her constables solve their case successfully.