Though Andrew Henry is a successful businessman, he has littleexperience in the fur trade when he joins a trapping expeditionheaded into the uncharted distant West. His partner, amercurial Spanish-American trader named Manuel Lisa, nearlystarts a mutiny by antagonizing American trappers whilefavoring the more experienced Canadian rivermen. When Lisasuddenly departs the expedition, Henry takes charge and vowsto find the lucrative beaver furs in a region called ThreeForks, which is ruled by the fearsome Blackfeet tribe. Alongthe way, he enlists the help of famous mountain man JohnColter, whose dire warnings about Three Forks cause deepunease among the men. Colter's fears come true when theBlackfeet strike again and again, killing some of the men andforcing the rest to take refuge in a hastily built fort. Beforelong, Henry must make an agonizing choice: break his word andabandon the trapping venture, or lead the remaining men deeperinto darkness to complete his mission.
