Peter Ross joins us to talk about his book Upon A White Horse. A book and conversation that take us on a journey around the British Isles, exploring the ancient sites and meeting many of the people that love them, protect them, research them and carry the stories of the stones with them. We talk about Peter's process of writing, about rural and urban spaces that are home to stone circles. about music and about how Upon A White Horse forms the conclusion to his unofficial trilogy that also includes A Tomb With a View and Steeple Chasing.