The Hour before dark.

Summary: "When Nemo Raglan’s father is murdered in one of the most vicious killings of recent years, Nemo must return to the New England island he thought he had escaped for good, Burnley Island…and the shadowy farmhouse called Hawthorn. But this murder was no crime of human ferocity. What butchered Nemo’s father may in fact be something far more terrifying…something Nemo and his younger brother, Bruno, and sister, Brooke, have known since childhood. There are secrets buried on Burnley Island. Within the rooms of Hawthorn, beautiful Brooke Raglan has begun to go mad. She sees faces at the windows and wanders the night, trying to find what she believes is a monster. Bruno Raglan has wiped the memory of a terrible event from his mind. Now he compulsively picks apart Hawthorn and discovers that within its walls lies a forbidden secret. As he unravels the mysterious of his past and a terrible night of his childhood, Nemo witnesses something unimaginable, and sees the true face of evil while Burnley Island comes to know the unspeakable horror that grows in the darkness."--