Cam's photographic memory helps a scatterbrained substitute teacher, especially when he discovers that he has misplaced his coat.

"A fish is nervous about a test and a mean-looking substitute teacher at school"--

"I never knew that there are so many different ways to be a teacher. When my family gets a new puppy, I learn that there are teachers who train dogs, teachers who teach swimming, teachers who teach music--and more!"--

When Iris's grandfather comes to her school as a substitute teacher, she has a hard time sharing him with the other students.