My mind is like the willow; it flexes and springs. My heart is a knot of oak. Let them try to wound me. Let them try.

One year after artist Tilda Forwells loses her husband, she is finally ready to move into the secluded Welsh cottage they were meant to be sharing together.

In the valley below her mountain home is a mystical lake which inspires a strange energy in her. She starts to experience potent dreams, visions, presentiments which all lead her to Seren, the witch and shaman who legend has it lived on this lakeshore in Celtic times.

As Tilda explores the lake's powers and her own, her connection to Seren grows stronger. And when she comes under grave threat, she must rely on Seren and this ancient magic to save her.