On the same night that her husband has been murdered, Sara Wrandall crosses paths with his murderess. But instead of turning her over to the police or imposing her own brand of vengeance on the woman, Sara takes her in, shelters her, and keeps the secret and truth of that night hidden, both from the law and the remaining Wrandall family. Hetty Castleton becomes Sara's friend and companion, much to Hetty's continual astonishment.