The facts pertaining to trees, forests and forestry are made most palatable through the experiences of Jim Castle, who is first introduced in the woods near his home, and later becomes a professional forester. The reader benefits from his knowledge as he examines and cares for his domain, plants new trees, determines the ages of old ones, and protects them from harmful creatures and diseases as well as the greatest enemy of all -- the forest fire. Jim grows through his profession, and with him the reader goes beyond the limited boundaries of the woods to find out how trees benefit society in a variety of ways.