Guest Stars Mark Lewis Jones as Steve Baldini Aneirin Hughes as Tom Howells Bradley Freegard as Evan Howells Hannah Daniel as Cerys Jones 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 Angeline Ball as Gael Reardon Matthew Gravelle as Terry Price Mali Harries as Bethan Price Richard Elfyn as DCI Huw Parry Kizzy Crawford as PC Emma Jones Menna Trussler as Eira Jones Mair Rowlands as Carol Foster Elen Rhys as Sian Hughes Matthew Raymond as Erlynydd Anita Reynolds as Cadeirydd Russell Daniels as Bownsar Calum Wragg-Smith as Clerc Y Banc