BBC Wales’ 8-part drama series “Hidden” (in Welsh, “Craith”) has now come to BBC4 – showing on Saturdays at 9pm, starting on 9th June. Starring Sian Reese-Williams as DCI Cadi John, the story follows an investigation following the discovery of a body in Snowdonia National Park. John Hardy and his Cardiff-based team created the atmospheric soundtrack with its memorable title theme.