Set in a police station in Brighton in the 1950s, it tells the story of Inspector Steine (Michael Fenton Stevens) and his colleagues Sergeant Brunswick (John Ramm) and Constable Twitten (Matt Green), plus the station charlady Mrs Groynes (Jan Ravens in Series 1 and Samantha Spiro from Series 2 onwards).
An Alleyway or Twitten that passes by the site of the former True Blue public house, is known locally as 'Dark Alley' due to the black clinker surface laid down along its route.