After Case Williams is left at the altar—as it turns out, his bride-to-be was in love with his best friend—he decides to move to Montana and set his mind on work. There he meets Roy Pemberton, an agent sent to keep the peace between Native Americans and settlers, and the two start working together to build a wagon freight company. After a while, Roy invites Case home to meet his wife and two single daughters.

Roy knows what kind of man Case is, so he pushes his eldest, Diana, into a courtship with him. But things don’t go quite so smoothly. As Case realizes his lack of romantic feelings for one daughter, he finds he is attracted to the other, Diana’s younger sister, Maddie—who harbors her own passion for the handsome stranger. Will they give in to their forbidden love or be forced to keep their feelings secret?