Rawblood, Catriona Ward
In 1910, eleven-year-old Iris Villarca lives with her father at Rawblood, a lonely house on Dartmoor. Iris and her father are the last of their name. The Villarcas always die young, bloodily. Iris believes it's because of a congenital disease which means she must isolate herself from the world. But one sunlit autumn day, beside her mother's grave, she forces the truth from her father: the disease is biologically impossible. A lie, to cover a darker secret.
The Villarcas are haunted, through the generations, by her. She is white, skeletal, covered with scars. When a Villarca marries, when they love, when they have a child - she comes and death follows. When Iris is fifteen, she breaks her promise to remain alone all her life, and the consequences are immediate and horrific.