The story follows a young woman who impulsively swims out to rescue a stranger from a dangerous shore, an act that leaves her injured and burdened by shame. While she convalesces under the care of her older sisters, family responsibilities and strained relations test her resolve. The household emigrates to a remote prairie settlement where crop triumphs and disasters, financial peril, and unsettling rumours shape daily life. A prolonged mystery involving a man's identity and motives unfolds through risky errands and revelations. The narrative ends with the clearing of misunderstandings and the heroine's steady moral growth.