In the dangerous depths of Oregon's Columbia River, Trev Gowdy targets one of the world’s biggest freshwater fish, the White Sturgeon. In the shadow of a towering hydroelectric dam the crew navigate deep, fast-flowing waters posing constant peril, knowing one misstep into the busy shipping lane could lead to disaster. As the day unfolds, he hooks into a series of impressive catches, but his sights are set on a true giant. When his reel shrieks in protest and a monstrous creature breaches the surface, threatening to capsize a nearby boat, Trev realizes he's in for the fight of his life.