Now: When Megan's father gets a letter containing a secret from the past, he asks her to go to the Cornish village of St Mawgen Cove to get to the bottom of the mystery. Megan is happy to take a holiday after a challenging year but as soon as she checks into The Ship Inn something feels amiss. There are noises in the room above, the locals tell tales of smugglers and shipwrecks and she can't escape the story of the witch who waits and watches, weeping on the top of the cliff. 1625: Susanna and her daughter Katel live a contented life, but without the protection of a husband and father, Susanna fears for Katel’s future as she blossoms into womanhood. The fishing community of St Mawgen Cove is close knit but when misfortune arrives in the cove, it's not long before villagers are looking for someone to blame. And when talk turns to witches, Susanna knows she and Katel are no longer safe. Can Megan bring peace to St Mawgen and to two women who have been broken-hearted for centuries?