1648. Alie Gowdie marries Richard Webster during a turbulent time in Scotland's history. Charles I is about to lose his head, and little does Alie know that she too will meet a grisly end within the year.

2019. Sarah Sutherland is struggling to cope with the demands of her day job, caring for her elderly father and keeping tabs on her backpacking daughter. She wanted to be an archaeologist, but now in her forties, she is divorced, alone, and there seems to be no respite, no glimmer of excitement on the horizon. However, she does have a special affinity with the Kilgour Witch, Alie Gowdie, who lived in Sarah's cottage until her execution in 1648, and Sarah likes nothing better than to retreat into a world of sorcery, spells and religious fanaticism.

Her stories delight tourists as she leads them along the cobbled streets of her home town, but what really lies behind the tale of Alie Gowdie, the Kilgour Witch? Can Sarah uncover the truth in order to right a centuries-old wrong? And what else might modern-day Kilgour be hiding, just out of sight?