Twelve-year-old Sam Gribley runs away from his overcrowded New York City family to live alone in the Catskill Mountains, where he hollows out a tree for shelter, trains a peregrine falcon, and teaches himself to live off the land through an entire year. The novel is a detailed and affectionate guide to wilderness living told through Sam's journal entries, balanced by warm humor and a genuine love of nature. A classic survival-and-adventure story brimming with practical ingenuity.