Whilst working on the soundtrack for her first Hollywood film, singer-songwriter Iris Evans (Suki Waterhouse) struggles to balance the demands of her burgeoning career with those of her family. Her mother Mary has terminal cancer, her ex-boyfriend Bobby refuses to accept they're no longer together. To further complicate matters, her musical hero, American composer Eleanor Roberts (Jennifer Grey), arrives at her parents' home in Wales to help her work, bringing another set of emotional issues for Iris to deal with.