Roger and Adelia are the very best of friends. They've spent many springtimes collecting birds' nests, autumns jumping into piles of colorful leaves, and winters building snowmen. When the time comes for Adelia to move away, the two friends must say good-bye. But Adelia has one parting gift for Roger: She will teach him, once and for all, how to climb a tree. Lyrical and colorful, the narrative flips between Adelia's instructions ("hold on tight,"...