Pointman by Robert Ellis Miller

6.20

Arbitrageur Constantine "Connie" Harper is sentenced to a maximum security prison for fraud and decking the DA at his trial. Upon his release, one of his cellmates asks him to bodyguard his sister Rosie, who is being threatened by a diamond broker over some diamonds. Connie becomes a reluctant bodyguard to Rosie. While in prison, his name got on "the list," a collection of people to go to when you've exhausted all other options.