Where did you get the idea for your most recent book?
My adult children ride in the MS 150, a charity bike ride from Houston to Austin, Texas. A few days after the Boston Marathon bombing, my wife and I stood in Austin, watching riders finish the 150 mile course.
I saw the comparison between the Boston Marathon and the MS 150. Both have large numbers of participants and draw large crowds of spectators to the finish.
My writer's brain wondered what would happen if someone tried to bomb the finish of the MS 150.