21:00StrikeTroubled BloodEpisode 4BBC One Duration: 59 minutes Audio described Mon 19th Dec 2022, 21:00 on BBC One South HDAvailable for yearsWatch nowStrike realises that Margot’s killer is responsible for many other murders that have gone undetected, and lays a trap.ContributorsCormoran Strike:Tom BurkeRobin Ellacott:Holliday GraingerSaul Morris:Jonas ArmstrongKim Sullivan:Sutara GayleSam Barclay:Jack GreenleesMargot Bamborough:Abigail LawrieSteve Douthwaite:Robin AskwithPat Chauncey:Ruth SheenWriter:Tom EdgeDirector:Sue TullyProducer:Alex RendellExecutive Producer:JK RowlingProduction Company:Bronte Film and Television LtdGenresDramaCrimeBrandStrikeSeriesStrike: Troubled Blood Source: BBC Online