Knuckleduster
(Book)

"Brody is a vigilante for hire who tracks down women's abusive husbands to repay pain with pain. He wants to help the women and doesn't like accepting their money, but he has no choice. Injured in the military and sent home, Brody needs expensive batteries to power his carotene lenses. Without them, he is completely blind. When Thorp Ashbury, an old friend from the service, invites him to rural Illinois, Brody seizes the opportunity to escape the city and violence. Instead, he uncovers a conspiracy that could shake the foundation of everything he stands for" -- p. [4] of cover.