Guest Stars Oscar Unsworth as Rhodri Howells Harry Unsworth as Rhodri Howells Seren Letherby as Rhodri Howells Mark Lewis Jones as Steve Baldini Aneirin Hughes as Tom Howells Hannah Daniel as Cerys Jones Bradley Freegard as Evan Howells Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Betsan Llwyd as Delyth Lloyd Rhian Morgan as Marion Howells Matthew Gravelle as Terry Price Mali Harries as Bethan Price Richard Elfyn as DCI Huw Parry Menna Trussler as Eira Jones Nia Roberts as Saran James Beth Robert as Rhona Connaugh Howard as Paffiwr