The film adaptation of Fflur Dafydd’s bestselling novel Y Llyfrgell, (The Library), starring Catrin Stewart (Doctor Who, Stella), is an offbeat thriller set in the National Library of Wales. The film, directed by Euros Lyn (Broadchurch, Happy Valley, Daredevil), explores the secrets and lies at the heart of storytelling. The author and actress discuss the film and show clips with journalist and writer Jon Gower.