As Charley's little letters get lined up in their beds and call out their names, they discover that little x is missing along with one of Charley's pencils. So what do they do? The little letters fly on a pencil out into the night to search for him and find him a Master M's castle. Little x is sad because he's rarely ever used. Can the other little letters convince little x to come home? Check out this fun tale written by Audrey Wood and illustrated by Bruce Wood. My four year old son loved pointing to the letters and reading the alphabet song over and over again. The best part is that it shows the lowercase letters, which is great for practicing lowercase alphabet recognition. Educational and fun, now that's a great story in my book!