Two years ago, Sam Gribley ran away from New York City to live in the Catskill Mountains. Now his younger sister, Alice, has joined him and is quietly living in a treehouse of her own nearby. Everything changes when a conservation officer confiscates Sam's falcon, Frightful, and Alice suddenly vanishes. Sam leaves his home to search for Alice, hoping to find Frightful, too. But the trail to the far side of the mountain may lead Sam into great danger.

The Sequel to My Side of the Mountain