"The River Why" is a novel by David James Duncan that follows the journey of a young man named Gus Orviston, who seeks meaning in life through his passion for fishing. Set in the Pacific Northwest, the story explores themes of nature, self-discovery, and the complexities of human relationships. As Gus retreats to a secluded cabin by the river, he encounters various characters, including his quirky neighbors and a love interest named Evelyn. The narrative intertwines his love for fly fishing with philosophical reflections, ultimately leading him to a deeper understanding of himself and the world around him.