S4C and Channel 4 released first look images of "Y Golau: Dŵr"

S4C and Channel 4 have been released first look images of the second series of S4C’s mystery drama "Y Golau" / "The Light in the Hall". The series, titled "Y Golau: Dŵr", will air in Welsh, with subtitles, on S4C from 14 September 2025. The English-language version, "The Light in the Hall: Still Waters" has been acquired by Channel 4 and AMC+.

"Y Golau: Dŵr" returns to Llanemlyn, where a controversial redevelopment plan to expand the reservoir is reigniting old tensions. The story captivates Caryl, a young journalist, who becomes entangled in a complex web of personal betrayal, familial secrets, and dark mysteries, which raises doubts about the imprisonment of Rhys Owen for the murder of his cousin Llŷr during the protest against the expansion in 1995.

"Y Golau: Dŵr" is produced by Triongl, Long Story TV and APC production for S4C, made in collaboration with AMC+, Channel 4 and the Welsh Government via Creative Wales. The second series returns features an all-star ensemble cast with Siân Reese-Williams ("Hidden/Craith", Mark Lewis-Jones ("Yr Ymadawiad"), Nia Roberts ("Tree on a Hill/Pren ar y Bryn" and Robert Glenister ("Sherwood").

The series is created by Regina Moriarty (creator and lead writer of the first series of Y Golau/ The Light in the Hall) who has also written two of the episodes. The other four episodes have been penned by other leading Welsh writers; Siân Naiomi, Anwen Huws, Catherine Linstrum and Angharad Elen.

Producer Nora Ostler Spiteri said: "It has been a pleasure to collaborate once again with Long Story and APC to bring this story to the world. A big thank you to Gwenllian Gravelle and S4C for their warm support and to Sundance Now, Creative Wales, and C4 for making this possible. It has been wonderful to collaborate with such a talented cast and crew, and it was lovely to return to Llandovery to bring the world to life."

Gwenllian Gravelle, S4C’s Head of Film and Drama said: “After the runaway success of 'Y Golau' Series 1, the world of Llanemlyn returns with a mystery darker, deeper, and more thrilling than ever with 'Y Golau: Dŵr'. With a powerhouse cast and a story that grips from the first moment, this is one journey our S4C viewers won’t want to miss.”