In Edwardian Suffolk, a manor house stands alone in a lost corner of the Fens: a glinting wilderness of water whose whispering reeds guard ancient secrets. Maud is a lonely child growing up without a mother, ruled by her repressive father. When he finds a painted medieval devil in a graveyard, unhallowed forces are awakened. Maud's battle has begun. She must survive a world haunted by witchcraft, the age-old legends of her beloved fen - and the even more nightmarish demons of her father's past.