Guest Stars Victoria Pugh as DSI Susan Lynn Garmon Rhys as PC Ryan Davies Lowri Izzard as PC Mari James Sarah Tempest as Alys Mitchell Lisa Victoria as Catrin Pritchard Ffion Dafis as Kelly Owen Owain Gwynn as Sion Wells Bryn Fôn as Hefin Mathews Lois Elenid as Beca Mathews Jac Jones as Liam Pritchard Dyfrig Evans as Glyn Jones Gruffydd Wyn Jones as Jason Williams Nia Haf as Lois Jones Paul Whitlock as Roy Mali Tudno Jones as Rachel West