Joe Huff is a policeman who infiltrates a gang of rockers terrorizing a small town in Mississippi, bringing under his control not only its ordinary residents and underground businessmen, but also local authorities, including representatives of justice. Joe's appearance and demeanor allow him to pass himself off among the rockers as his own and, under the name of Joe Stone, begin developing an operation to capture the entire motorized and heavily armed gang, which is led by the ruthless Chains.