My brother's keeper / Tim Powers.

"Howarth, Yorkshire 1846. In a parsonage at the edge of the moors, a widowed rector lives with his family: three daughters and their dissolute brother, Bramwell. Though the future will celebrate Charlotte, Emily and Anne, right now they are unknown, their genius concealed. In just a few short years they will all be dead, and it will be middle sister Emilya's chance encounter with a grievously wounded man on the moor that sets them on the path to their doom. For there is an ancient pagan secret haunting the moors, a dark inheritance in the family bloodline and something terrible buried under an ogham-inscribed slab in the church. Not only are their lives at stake, but their very souls."--Back cover.