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 Archie Panjabi as Asha Israni Sara Vickers as Leanne Randall Colette O'Neil as Bella Anna Chancellor as Phyllis Brennan James Cosmo as Arthur McCall Jamie Michie as Lowrie Kate Donnelly as Grace Ace Bhatti as Calvin Sarwar Alison Peebles as Vicky Kirkland Kevin Mains as DS Iain Boyd Claire Dargo as Kelly Paterson Edward M Corrie as Ben Brennan Gregor Firth as Prison Officer Sandy Welch as Calvin's Lawyer