Guest Stars Mark Lewis Jones as Steve Baldini Hannah Daniel as Cerys Jones Eiry Thomas as DI Susan Williams Lacey Jones as Megan Howells Demi Letherby as Alys Howells Aneirin Hughes as Tom Howells Suzanne Packer as Delyth Lloyd Bradley Freegard as Evan Howells Catherine Ayers as Lisa Connors Alex Harries as Arthur Davis Rhian Morgan as Marion Howells Angeline Ball as Gael Reardon Mali Harries as Bethan Price Matthew Gravelle as Terry Price Richard Elfyn as DCI Huw Parry Kizzy Crawford as PC Emma Jones Menna Trussler as Eira Jones Gareth Jewell as Gavin John Mair Rowlands as Carol Foster Elen Rhys as Sian Hughes Matthew Raymond as Prosecutor Anita Reynolds as Chairperson Russell Daniels as Doorman Calum Wragg-Smith as Bank Cashier