In this new mid-week drama series we are introduced to a wide range of characters, many of whom harbour secrets. Some live in Llanberis and others live in the Gower, but one person holds a link between them all – Delia Evans. Mal Harries, a ‘blast from Delia’s past’, has been living in Llanberis at the foot of Snowdon for quite a few years and is a member of the local mountain rescue team. A television news item reporting his successful rescue of a young girl eases the tension between Mal and his partner Gwen, but also compels Delia to travel to Llanberis with her daughter Caitlin. There, she reveals two secrets to Mal that will dramatically change his life.