So I'm looking for this book....?

I read the back of a book forever ago and I remember wanting to read it, but I can't for the life of me remember what the title was. It was about this father and son that kidnap a girl thinking they can get a good bit of ransom for her, but it turns out not to be so and I think they go on the run with her. I also remember she was blind, but that's about it. Anyone know what I'm thinking of??