A powerful documentary in S4C's 'O'r Galon' series follows the spiritual quest of a Welsh teenager as, following the untimely death of her father, she seeks answers to the ultimate question: what happens when we die?
The programme O'r Galon: Ble Wyt Ti Nawr? (From the Heart: Where Are You Now?), on Wednesday 9 May, profiles 14-year-old Martha O'Neil from Ammanford as she asks searching questions about life and death and explores the beliefs of different world faiths.
Three and a half years ago, the highly respected music promoter Joe O'Neil died suddenly while in a London recording studio with Welsh choir Only Men Aloud. He was only 54 years old.
The news shocked Joe's many friends and admirers who had seen him help shape the careers of a host of Welsh performing artists, including Katherine Jenkins, Bryn Terfel, Aled Jones and Elin Manahan Thomas.
For his family, his wife Sian, daughter Martha and son Finn, now nine years old, it was a devastating blow. For Martha, in particular, it raised fundamental questions about the meaning of life.
"I've wanted answers to some of life's biggest questions since I was a small child, and Dad always helped me find them," says Martha, a Year 9 pupil at Ysgol Gyfun Maes Yr Yrfa.
"After my dad died one huge question came to my mind - what happens to everyone's spirit after we die? I wanted to meet people from different religions to hear what they believe and then come to my own conclusion."
Joe O'Neil was brought up a Catholic in Bath, but had a broad-based spiritual belief comprising traditional and esoteric religions which embraced meditation.
Cardiff-based production company Colour Television follows Martha's spiritual journey which starts at her own chapel in Ammanford, where she discusses Christian beliefs in eternal life with the minister, Rev. John Talfryn Jones.
Her journey then takes her to the Govinda's Hindu temple in Swansea where she meets Hare Krishna follower Steve Phillips. Martha discovers that Steve also lost his father at a young age, which started his own quest for spiritual enlightenment.
At the multi-faith cemetery in Ely, Cardiff, young Muslims Nadia and Sara Yassine explain to Martha about their Islamic beliefs.
Next, Buddhist follower Paul Mason leads Martha through a meditation session at Cardiff Buddhist Centre which she finds deeply moving and makes her feel very connected to the spirit of her father.
Spiritualist Medium Tony Leeson explains how followers of the faith believe they can communicate with the dead. As a young man Martha's dad Joe attended a Spiritualist centre and now Martha and her mum Sian visit Cardiff's oldest Spiritualist church.
Finally, she meets the musical director of Only Men Aloud Timothy Rhys-Evans, who was with her father when he died. Life has somehow come full circle since that tragic day in October 2008 because now both Martha and Finn are in Tim's children's choir, Only Kids Aloud.
Martha makes her own assessment of the different belief systems she's explored. What is certain is that wherever he is now, her father's influence will remain with Martha as long as she lives.
As Martha says, "The fact that you can't see something doesn't mean it isn't there. You can't see love but you can feel it, and I can still feel my dad's presence around me."