Guest Stars Tim Treloar as The Walking Man Frankie Keita as Ewan Ciarán Joyce as D.I. Prody Simon Dwyer-Thomas as Bones Anthony Webster as Ivan Penderecki Kai Owen as D.I. Matthews Finnbar Hayman as Sergeant Cox Mabli Jên Eustace as Jessica Bell Amanda Drew as Superintendent Driscoll Ruby Snape as Prody's Mum Karen Ascoe as Erin Richard Elfyn as Mr Bell Crisian Emanuel as Mrs Bell Chris Hoskins as Armed Man 1 Steven Andrew as Elis Hedydd Dylan as Beca Van Der Bolt Nathan Sussex as Detective 2 (Molina) Rhys ap William as Detective 1 (Honey)