Everyone in Ballyfran has a secret, and that is what binds them together…

Fifteen-year-old twins Madeline and Catlin move to a new life in Ballyfran, a strange isolated town, a place where, for the last sixty years, teenage girls have gone missing in the surrounding mountains.

As distance grows between the twins - as Catlin falls in love, and Madeline begins to understand her own nascent witchcraft - Madeline discovers that Ballyfrann is a place full of predators. Not only foxes, owls and crows, but also supernatural beings who for many generations have congregated here to escape persecution. When Catlin falls into the gravest danger of all, Madeline must ask herself who she really is, and who she wants to be - or rather, who she might have to become to save her sister.