I'm looking for a book; it's about home invaders that wear ski masks and kill an entire family and gouge their eyes (they only need the father's eyes to open his lab) save for a daughter called Tara whom they leave chained in the basement. She breaks her thumb to escape from the handcuffs.
I think the dad in the book discovered a secret ingredient to put in food and that's why he was attacked. He was meant to be home alone but the whole family was there.
by francopperfield