Attentive young Sophie lives with her family at a lighthouse on the shore of Lake Superior. At this essential outpost, everyone has a job to do, whether baking bread, fishing for dinner, or caring for the light. And in this isolated place, in a time long before smartphones and Internet connections, news arrives only by ship, and information is sometimes gathered in unexpected places. Sophie is attuned to her natural surroundings, and she reads signs in a dandelion bloom, a spider's web, seagulls in flight, and even a squeaky door. All these clues lead her to one conclusion: a storm is...