That Other Voice is the story of one person's search for an answer to the ultimate spiritual mystery: whether a higher power can communicate with us directly.

Graham Turner - the BBC's first economics correspondent - has journeyed across the world to discuss the question: with the Dalai Lama's brother in his Himalayan home, with former Archbishop of Canterbury Rowan Williams in Cambridge, with a community of Sufi Muslims in Jordan, with a Hindu orthopaedic surgeon in India, and with leading British Rabbis Lord Jonathan Sacks and Jonathan Romain.