"Narwhal and Jelly become the coolest teachers in the world wide waters in the hilarious sixth book of this blockbuster graphic novel series! Dive into four new stories about Narwhal and Jelly becoming substitute teachers! The two best friends come across an enthusiastic school of fish one morning. Unfortunately, Mr. Blowfish, their teacher, has come down with a cold, and class will have to be cancelled . . . until Professor Knowell (Narwhal) and...