In May 2014, Rhys released his new work, American Interior, a combined project of an album, a film, a hardback book and an app for mobile devices. The film was co-directed by Dylan Goch, who also worked with Rhys on his previous film, Separado! (2010).
In 2014, the pair co-directed a film about the Welsh explorer John Evans, American Interior. It was released in cinemas in the UK on 9 May 2014.
In 2014, Rhys composed the film score for Set Fire to the Stars about Dylan Thomas and starring Celyn Jones and Elijah Wood. The jazz group he formed to record the music features drummer Chris Walmsley, double-bassist Jim Barr (Portishead), Gavin Fitzjohn on trumpet and pianist Osian Gwynedd (formerly of Big Leaves and Sybridion) on piano, with strings arranged by Gruff Ab Arwel (Y Niwl). Additional string music was recorded by the Elysian Quartet. In September 2015, Rhys won the 2015 BAFTA Cymru award for Original Music for the score.