Life is hard for Willa, Grace and Freya, and their three younger sisters. Six motherless girls working a farm, living in fear of their cruel father and the superstition that obsesses him - The Curse of Six Daughters. With the arrival of the mysterious Full Moon Fayre, there's a chance for the eldest girls to steal a moment's fun, but the day the fayre moves on, Grace vanishes. Willa goes after her, following a trail that leads into the dangerous Lost Marsh, where it is said a will-o'-the-wisp lures lost souls into the dark waters of the mire. If Willa is to survive and reunite her family, she will need to unravel the secrets her father has kept hidden, and face her own deepest fears ...