Trial & Retribution is a feature-length ITV police procedural television drama series that first aired on 19 October 1997. Written and devised by Lynda La Plante as a follow-on from her successful television series Prime Suspect, each episode was typically broadcast over two nights. David Hayman stars as the main protagonist of the series, DCS Michael "Mike" Walker. Throughout the series, he has two main sidekicks: DI Pat North in Series 1–6 and DCI Róisín Connor in Series 7–12.