This heartwarming story follows Anna and Caleb, two children living on the prairie with their father after their mother's death. Their lives change when Papa advertises for a wife and receives a letter from Sarah, a woman from Maine who describes herself as 'plain and tall.' Sarah comes to visit for a month, bringing new experiences and hope, as the children worry she might miss her old home too much to stay. The story beautifully explores themes of family, belonging, and the courage it takes to build new connections.