Silent WitnessSeries 20Part 2: Covenant, Part TwoBBC One Duration: 59 minutes Audio describedFirst broadcast: Tue 24th Jan 2017, 21:00 on BBC One WestLatest broadcast: Tue 24th Jan 2017, 21:00 on BBC One WalesAvailable for yearsWatch nowNikki helps Becky come to terms with her trauma. Jack is paranoid that Clarissa will leave the Lyell Centre. Paul is in way over his head.ContributorsDr Nikki Alexander:Emilia FoxDr Thomas Chamberlain:Richard LinternJack Hodgson:David CavesClarissa Mullery:Liz CarrLiam Stanwell:Joel RobinsonPaul Kirkeby:Michael WinderTommy McAteer:Lee RossDCI Tony Underhill:Gary BeadleDI Jodie Tanner:Rebecca CalderStuart Teller:Gerald LepkowskiClive Maitland:Dale RapleyBecky Teller:Lottie TolhurstFrankie McAteer:Chris GordonBill McAteer:Dean WilliamsonJason Bradwell:Jamie ZubairiCarol McAteer:Lisa KayTearful Mum:Candice OnyeamaMichael Maitland:Harry Lister SmithKyle Jesmond:Moneer ElmasseekMax Thorndyke:Daniel WeymanProducer:Ceri MeyrickDirector:David DruryExecutive Producer:Anne PivcevicWriter:Richard DavidsonGenresDramaCrimeBrandSilent WitnessSeriesSilent Witness: Series 20 Source: BBC Online