Jericho Coulter, the oldest of six brothers who own a ranch in the Montana Territory, but their biggest secret is the Sapphire mine on their property that supplies everything they need and more. To keep the secret, they allow no one onto the ranch. But when two sisters show up near the mine saying the oldest brother sent for one of them as a mail-order bride, something is clearly afoot. The other sister, Dinah Wyatt, claims to be a doctor, and her skills are needed immediately when one of the brothers is badly injured in a wagon accident. The sisters stay on to help nurse his wounds, and Dinah and Jericho fall in love against all odds.