What would the main character be likely to do if s/he visited? Talk about her husband and son.
If you were in a problem situation like one in the book, how would you have acted? I would use any means possible to get away from the brothers. I would fight to the end.
Find one word that describes a character in your book very well. Worried - Hank was trying to protect his son. He got a doctor for Alison. He talked with police. He took Jimmy to his mother's. He went back to check on Alison.
Compare two of the characters in this book. Ben - born killer, on death row. Warden Tummelson - Been at the prison for 11 years. Scrubs his self raw, trying to get clean.
Disclosure: I received a review copy of this book from the author.