Guest Stars Steven Robertson as DC Sandy Wilson Alison O'Donnell as DS 'Tosh' MacIntosh Lewis Howden as Sgt Billy McCabe Mark Bonnar as Duncan Hunter Erin Armstrong as Cassie Perez Julie Graham as Rhona Kelly Neve McIntosh as Kate Kilmuir Fiona Bell as Donna Killick Julia Brown as Molly Kilmuir Stephen Walters as Thomas Malone Sean McGinley as Drew McColl Sophie Stone as Jo Halley Gerard Miller as Alan Killick Gayle Watson as Mary Hunter Carolin Stoltz as DI Anke Strom Arnmundur Björnsson as Lars Bleymann Nathan Welsh as Robert Downing Eldar Skar as Division Organiser Kåre Conradi as Agent Nielsen