“Can't cook but doesn't bite." So begins the newspaper ad offering the services of an "A-1 housekeeper, sound morals, exceptional disposition" that draws the attention of widower Oliver Milliron in the fall of 1909. That unforgettable season deposits the ever-whistling Rose Llewellyn and her font-of-knowledge brother, Morris Morgan, in Marias Coulee along with a stampede of homesteaders drawn by the promise of the Big Ditch—a gargantuan irrigation project intended to make the Montana prairie bloom.