Biologist Hildy Nybo is passionate about her study of the Pacific Northwest's wild fish. But behind her professional brilliance, her reclusive private life hides another story—of a childhood where she lost things, and never found them. Memories haunt her when she returns to her family home on the Elwha River, but she joins the river's scientists as two old dams fall. There, the truth of her past surfaces, and Hildy wonders if she can banish her shadows and follow her river's course to freedom.