The story of two police officers Thornley and Palmer who go undercover in a women's prison. One posing as a prison officer, the other as a in-mate in HMP Bowman. The purpose of the operation to gain information from Dorothy Webster (Dolly) on the sex trafficking of young girls. David Webster ( Dolly's Husband) has his connections and dealings with local councils and private investors. Thornley and Palmer soon come into conflict with Officer Harvey, who plans to expose them. It's not long before all involved begin to "screw over" for personal gain.