Deep in the mountains of Pennsylvania, the Brookfield Mine has more to offer than coal - three women and promise that can never be broken.

Maggie McCauley is trying to keep her family safe at any cost. But the mine holds no discrimination as to who it harms, a harsh reality Maggie fears every day.

As the daughter of the mines superintendent, Alice Tilton's life is neatly planned and thought-out against her own wishes.

Alice wants more for her future and for the men that work in the mine.

Robin Thatcher is an orphan from the mountains and her only option for survival is to change her identity and head for the mines. So enters Robby March.