A musical documentary film, a product of the imagination of musician Cian Ciarán - based on the legend of Rhys and Meinir, the most romantic and tragic love story in the Welsh language. Combining classical music, poetry, animation and archive film, the documentary presents a fresh and exciting interpretation of the legend. The worldwide première of Cian's first orchestral composition, Rhys a Meinir - performed by the BBC National Orchestra of Wales - was held in November 2016. Using a recording of the performance, the film documents the preparations and parts of the performance, as well as examining the legend and the history of Nant Gwrtheyrn. The poet Gruffudd Antur has composed a stunning sequence of englynion poems especially for the film which features a thrilling performance of the verses by the actor Rhys Ifans.