Mitchell, naturalist and author of Living at the End of Time, decided to hike to the grave of Thoreau from Concord, Massachusetts, burial site of a member of the party of Sir Henry Sinclair, a 16th-century Scottish explorer, in an attempt to learn more about that famous landscape. Avoiding most roads and accompanied by two eccentric friends on the 15-mile walk, the author investigates a wide variety of related topics, including natural history of the area, mythology, and related literature. One of the most interesting aspects of this pilgrimage is the variety of personal histories related by local residents encountered on the trek. Recommended for local and larger natural-history collections.