Guest Stars Steven Robertson as DC Sandy Wilson Alison O'Donnell as DI Alison "Tosh" McIntosh Lewis Howden as Sgt Billy McCabe Mark Bonnar as Duncan Hunter Erin Armstrong as Cassie Perez Finn Den Hertog as Drew Alison Peebles as Vicky Kirkland Sophie Rundle as Sophie Lindy Whiteford as Jackie Haldane Gemma Chan as Hattie James Geraldine Alexander as Gwen James Jim Sturgeon as Ronald Haldane Claire Rafferty as Anna Haldane Alexander Morton as Joseph Wilson Martin Wenner as Professor Paul Berglund James Greene as Andrew Haldane Sandra Voe as Mima Wilson Uncredited Jane Moncrieff voices Radio Announcer
