A disillusioned Mexican-American War veteran decides to leave civilization behind and start anew in the wilderness of the Rocky Mountains. His aim is to become a mountain man, living off the land and learning the ways of nature. He comes across different characters who shape his journey, including a seasoned mountain man who serves as a mentor and imparts crucial survival skills. As he adapts to the rugged lifestyle, he experiences both the beauty and the harsh realities of wilderness living. Encounters with Native American tribes, harsh winters, and scarce food become part of his daily routine.

Over time, he establishes a solitary, yet fulfilling existence. Accidental interactions with settlers and looming conflicts with Native American tribes present constant challenges. His life takes a dramatic turn when he becomes responsible for a mute boy and an orphaned Native American woman. These new relationships add a layer of complexity and responsibility to his previously solitary life. Through trials and adversities, he discovers inner strength, resilience, and a deeper understanding of the true meaning of survival. His journey becomes a testament to the struggle for self-reliance and harmony with nature.