Two storm fronts are on a collision course for Lake Michigan, and Captain John "The Legend" Selvick is caught in the crosshairs with over a million pounds of cargo that almost goes overboard. Captain Ted Long steams North on a 100-mile run through a graveyard of wrecked ships, before traversing one of the most dangerous harbors of his career. In Duluth on Lake Superior, a career-making job comes in, and upstart Captain Mike Ojard and his family risk life and livelihood that a 44-year-old used tug can become a monster ice-breaker.