After four long years away, Esther Stanton returns to the prairie to care for her sister Charlotte's family following the birth of her second child. The month-long stay seems much too short as Esther becomes acquainted with her brother-in-law's new ranch hand, Stewart Brant. When obligations compel her to return to Cincinnati and to the man her overbearing mother intends her to wed, she loses hope of ever knowing true happiness.
Still reeling from a hurtful relationship, Stew is reluctant to open his heart to Esther. But when he faces a life-threatening injury with Esther tending him, their bond deepens. Heartbroken when she leaves, he sets out after her and inadvertently stumbles across an illegal slave-trade operation, the knowledge of which puts him, as well as Esther and her family, in jeopardy.