Book excerpt: "For some, running is a cornerstone in their lives. To those individuals, there is an unquenchable need to run on roads, trails and track. They cannot explain it, but that does not matter. Running is who they are. It is for them The Unforgiving Line is written. A timeless tale of Mac and an unexpected protégé, D.J., exploring a clash of worlds, wills, dreams and regrets. Blending the past and present of the glorious history of distance running."--Amazon.com.