The saga of the guardians of the forest at Sevenwaters takes up the story of Fainne, daughter of the former Druid Ciaran and the lost Niamh. Raised in the ways of magic, Fainne plans to become a solitary sorcerer like her father, but fate intervenes in the form of her grandmother, Oonagh, a sorceress with a penchant for cruelty and a desire to put an end to everything the Sevenwaters folks stand for. A prophecy tells of a way to preserve the old magic, and Lady Oonagh is willing to trick her granddaughter and torture her own son to break it. Though Fainne is forced to bow to her grandmother's will, the love of her family and her own strong ethics help her remember her true nature, as she learns about herself, her powers of sorcery and the part she plays in a prophecy that has tested three generations of women.