They say, "Write what you know." Charles Dudley Digges, Jr., knows about the lives of the mountain men in the 1840s (he'd participated in re-enactments for years) and had an interest in this time period, and particularly the variety of lifestyles the time offered to the common man. It was the era of the gold rush, mining, and the mountain man. His interest in the time period grew, and a story began to develop in his mind.