I loved this book. While I found "Once A Runner" to be pretentious and overhyped, Paul Maurer's "The Unforgiving Line" was beautifully written, unpretentious, and contained some of the best descriptions about running I've ever read.
The novel tells the story of D.J., a high school sophomore, and Mac, a former runner who nearly made the 1968 Olympic team and now lives with his beloved wife of 50-years who is slowly dying of complications from MS. D.J. and Mac strike up an unlikely friendship over running despite their pretty big differences, and Mac eventually ends up coaching D.J.'s track team.
I liked the characters in the story. Mac and his beloved wife, Mona, are wonderful characters and were always realistic and believable. D.J. came across as a very credible high school boy, and I thought the author handled D.J.'s complicated relationship with his father very well.
There's nothing especially groundbreaking in this novel and there are no plot huge twists (the novel proceeds fairly predictably which is fine - this is a novel set in the real world and that deals with real-world problems), but the descriptions of running are wonderful and really make the book. If you're looking for a solid good read in the spirit of "Once A Runner," or just would like to try a book about running, I think you'll enjoy "The Unforgiving Line." Highly recommended.