When novelist Edith Forbes experienced her first episode of multiple sclerosis in 1993, few treatments existed. The famously crippling disease was a medical mystery, its cause unknown and its course unpredictable. The only medical advice Forbes received then was to "live your life." She had other ideas.

Forbes grew up on a ranch in Wyoming, raised by a widowed mother who met challenges head on. Besides shouldering responsibility for seven children and a cattle ranch, Forbes's dynamo mother had ambitions to change the world. As a forward-thinking woman in a largely male business, she became a model of tenacity and independence for her daughter.

After her MS diagnosis, Forbes turned her fear into action, immersing herself in the medical literature to search for ideas. Finding an unexpected connection between the medical information and her own knowledge of agriculture, she embarked on a self-designed experiment that continues to this day.

Tracking a Shadow weaves together the story of Forbes's personal twenty-five-year medical experiment with a memoir of the mother whose constant determination to look for better answers shaped the author's unique approach to her disease.