In 1873, James Nugent, better known as Rocky Mountain Jim, is a hunter and trapper in Estes Park, a settlement just forming in the Colorado Territory. Scarred not only physically from a vicious grizzly bear attack, but emotionally from previous war experiences, he now lives alone in his cabin. When strong-willed Englishwoman Isabella Bird visits Estes Park and Jim acts as her guide in an ascent up treacherous Longs Peak Mountain, an unlikely but undeniable attraction forms between the two. Complicating Jim's life further is wealthy Lord Dunraven, who schemes to take over the region and turn it into his own private game preserve. Jim struggles to keep Estes Park safe from greedy self-interest while he fights for a relationship with Isabella. Reaching Rocky Mountain Jim recounts the compelling relationship between Jim and Isabella, told amidst a rugged, stunning landscape and a frontier just beginning to learn its potential.