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 Gayle Watson as Mary Hunter Eleanor Matsuura as DI Jessie Cole Tony McGeever as DS Ian Jackson