It all begins when Alexander H. Gory Jr. passes around a notebook in which he reveals a tantalizing secret: he has proof that their teacher, Mrs. Penrose, is a vampire. Soon the entire class is speculating and adding their opinions to the notebook until … it lands in Mrs. Penrose’s hands. It turns out that Mrs. Penrose has been keeping a secret: she is expecting a baby. But since the notebook is encouraging her students to write and improving their spelling and grammar, Mrs. Penrose allows it to continue circulating. The notebook becomes a terrific place for jokes, poems, stories and the correspondence between the students and their favorite author.