Denton 1981. Britain is in recession the IRA is becoming increasingly active & the country's on alert for an outbreak of rabies. Detective Sergeant Jack Frost is working under his mentor & inspiration DI Bert Williams & coping badly with his increasingly strained marriage. But DI Williams is nowhere to be seen. So when a 12-year-old girl goes missing from a department store changing room DS Frost is put in charge of the investigation...