Forbidden girl's endless night

Legends from the 19th century have survived to the present day, and historical records attribute the desolation of the castle and its surroundings to a natural disaster; and a novel whose author shares my name suggests that the disaster was man-made. The father, unable to accept the loss of his daughter, sought out all manner of witches and spells, even going so far as to sacrifice a living person in order to bring the dead girl back to life.
I also came across a young woman sleeping in a coffin, Hetty. Her torso was covered with splicing marks and she seemed to have forgotten much, wondering at her own existence but not very suspicious of me as an outsider. She even begged me to help her recover her memories...