In 1829, Jacob and Martin left Kentucky to become mountain men, trappers of the Rocky Mountains. The rugged mountains that lay beyond America's frontier remained mostly unexplored. In those days, when beaver were plentiful and buffalo roamed freely, the killing was good. The two young men would also find that life would be hardscrabble in the high frontier. They would face grizzly bears and hostile Indians. And they would risk horse wrecks...