Guest Stars Alison O'Donnell as DI Alison "Tosh" McIntosh Steven Robertson as DC Sandy Wilson 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 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 Arnmundur Björnsson as Lars Bleymann Carolin Stoltz as DI Anke Strom Eleanor Matsuura as DI Jessie Cole Amy Lennox as Sally McColl Tony McGeever as DS Ian Jackson Nathan Welsh as Robert Downing
