Back to the Trees and Caves - Hardcoverby Jonathan Klein (Author) After dedicating over three decades to managing wilderness areas for the USDA Forest Service, Jonathan Klein comes to a sobering realization: the wilderness within the lower forty eight is, at best, a theatrical semblance of the real essence of wild. Upon retirement at age sixty, Klein embarks on a solo canoe journey across the untamed expanses of northern Canada, yearning to uncover the authentic wilderness that eludes him.