Beyond Belief: The Life and Mission of John Hume is a new musical drama about the Irish politician who was one of the architects of the Northern Ireland peace process. Marie-Louise Muir goes behind the scenes of the production, staged in Hume's home city of Derry, with its director, Kieran Griffiths. She follows his young company of actors rehearsing for a major production which will be streamed live globally on the 25th anniversary of the signing of the historic peace accord, the Good Friday Agreement.