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 Conor McCarry as PC Alex Grant Angus Miller as Donnie Russell Catherine Walker as Alice Brooks Rakie Ayola as Olivia Lennox Derek Riddell as Chris Brooks Titana Muthui as Zezi Ugara Lorn MacDonald as Jamie Hayes John Kazek as Aaron McGuire Frances Mayli McCann as Niki Robin Laing as Gavin Laird Emma Mullen as Rosie Therese Bradley as Andrea Doyle Meghan Tyler as Mags Natali McCleary as Denise Amiera Darwish as PIRC commissioner
