Guest Stars Alison O'Donnell as DS 'Tosh' MacIntosh 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 Archie Panjabi as Asha Israni Saskia Reeves as Freya Galdie Anna Chancellor as Phyllis Brennan James Cosmo as Arthur McCall Jamie Michie as Lowrie Struan Rodger as Alec Ace Bhatti as Calvin Sarwar Kevin Mains as DS Iain Boyd Mark Cox as Tommy Monro Bryan Larkin as Gunman Claire Dargo as Kelly Paterson Beth Marshall as Police Officer Sean Hay as Arthur's Heavy Carole Anders as Forensic Nurse Gaylie Runciman as Crisis Worker