Engaging alphabet books are perennial bestsellers with unlimited demand. As in their previous collaboration, the Woods bring lower-case letters to life in a fun adventure. Little x has left, upset he's hardly used, and the other letters set out to find him. They find x playing the castle xylophone for the mysterious Master, capital M, who threatens to turn them into alphabet soup! Some quick thinking by Little x saves the day, and soon they are all on their way home--just in time to make Mom's birthday surprise: a cake with Little x all over. He's the only one who stands for kisses!