Parallels abound. Ethan is the bereft father, Josh, his lost son. Dwight is the damaged driver, Sam his child, damaged by dad in a different way. How each copes with the aftermath is the core of the tale here. Dwight runs over a young boy, then flees the scene, fearful of the impact the accident might have on his already tentative custody of his son. The wives are also portrayed, measured one against the other. The overall effect is of extreme sadness. It is a remarkably fast-reading book. I felt myself welling up at times. The characters are well painted, real enough to make us care about them. Trailers for the film make it look like the story is about revenge. It is not. It is about coping when bad things happen, or not.