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 Conor McCarry as PC Alex Grant Angus Miller as Donnie Catherine Walker as Alice Brooks Rakie Ayola as Olivia Lennox Derek Riddell as Chris Brooks Titana Muthui as Zezi Ugara John Kazek as Aaron McGuire Lorn MacDonald as Jamie Hayes Ryan Fletcher as Calum Dunwoody Therese Bradley as Andrea Doyle Kirsty Stuart as Morag Dunwoody Robert Cavanah as Graeme Benson Kate Dickie as DI Sam Boyd Jenni Keenan-Green as Claire McGuire Esther Oyewusi as Young Nigerian Woman Itxaso Moreno as Caz