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 Anne Kidd as Cora McLean Julie Graham as Rhona Kelly Marnie Baxter as Jenny Belshaw Sara Vickers as Leanne Randall Saskia Reeves as Freya Galdie Colette O'Neil as Bella Jack Greenlees as Craig Cooper Struan Rodger as Alec Jamie Michie as Lowrie Kate Donnelly as Grace Ciarán Hinds as Michael Maguire Bryan Larkin as Gunman Benjamin Cawley as Edison Andrew Rothney as Robbie Morton Victoria Balnaves as Callum's Mother Lewis Russell as Callum Peerie Michael Dylan as Martin the Hospital Porter Siu Hun Li as Ferry Chef John-Paul Hurley as Davy Neville