Guest Stars Harry Unsworth as Rhodri Howells Oscar Unsworth 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 Demi Letherby as Alys Howells Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Betsan Llwyd as Delyth Lloyd Rhian Morgan as Marion Howells Anastasia Hille as Gael Reardon Aimee-Ffion Edwards as Madlen Vaughan Rhashan Stone as DI Laurence Breeze Brochan Evans as Dyfan Vaughan Martha Bright as Angie Baldini Rhian Blythe as Anya Flye Alun ap Brinley as Geraint Jernigan Owen Arwyn as Shane Reardon Charlie Spring as Hyfforddwr Bocsio Lukasz Biela as Perchennog Odessa Foods