When Duncan arrives at school one morning, he finds a stack of letters, one from each of his crayons, complaining about how he uses them.

In a series of letters a boy, his science teacher, and his parents discuss the progress of a very unusual, sometimes frightening, plant that becomes more human as the summer progresses.

Dogs across the United States write to Mr. Mutt, a people expert, for help with their humans.

Oliver K. Woodman, a man made of wood, takes a remarkable journey across America, as told through the postcards and letters of those he meets along the way.

As a school project, George and Blaise become pen pals, writing rhyming letters about their favorite things to do, unaware that one is human and the other a dragon.