Sarah Maitland is consumed by two interests, managing her steel mill and raising her children, Blair and Nannie, to be honest and caring. As a result, she is shocked when Blair seduces Elizabeth Ferguson away from his best friend, Doctor David Ritchie, and marries her. Elizabeth soon realizes her mistake and begs David to take her back, but his mother Helena, calling upon personal experience, warns the couple against an extra-marital affair. Then, Sarah is injured in a mill accident and doctors predict that she will die in a few hours. David manages to save her, however, and when Blair comes to see her, he vows to divorce Elizabeth so that she can marry the man she really loves.