Guest Stars Catherine Ayers as Sali Annes Elwy as Greta Ella Peel as Ela Morgan Hopkins as Dai Rees Dylan Jones as Young Joe Sian Reese-Williams as Caryl Ioan Hefin as DCI Parry Aneirin Hughes as Gafyn Ifan Huw Dafydd as Wyn Aled Bidder as Rhys Mari Ann Bull as Young Shelley Rhian Blythe as Shelley Hannah Daniel as Izzy Hannah Mary Dando as Alana Andria Doherty as Bronwen Lisa Palfrey as Nina Shelley Rees as Ceri-Ann Mabli Jên Eustace as Young Izzy Tonya Smith as Carwen Llinos Daniel as Detective