Fatal Turn

A seasoned hiker goes missing from the Dolfor Moors after recording a social media video describing a narrow cave he intends to explore. A tragic accident? Nothing to see here, until a team of cavers disappear on a coastal potholing expedition, setting off a string of events that has DI Giles tearing her hair out. What, or who is the thread that ties this series of disappearances together?
A serial killer, thriller murder-mystery set in Wales.