Twin sisters Ana and Nan take matters into their own hands after the death of their mother—a famous author—believing her long-time critic is to blame. Set within the atmospheric walls of the National Library of Wales, their plan for revenge spirals into a tense and twisted thriller about truth, legacy, and the stories we leave behind.

Adapted from the original novel, the film was co-written and co-produced by Fflur and directed by BAFTA-winner Euros Lyn (Heartstopper, Broadchurch, Doctor Who). It became the first Welsh-language film to win Best Performance at the Edinburgh International Film Festival, was longlisted for a BIFA award for debut screenwriter and won a BAFTA Cymru award for Best Director, alongside four other nominations, including Best Writer. for Fflur for debut screenwriter, four BAFTA Cymru nominations . The film has since screened internationally, including in China, India, Europe and North America.