If there's a problem in school, there's no substitute for the world-saving substitute teachers of the S.O.S.! This is the fifth book of this hilarious, highly illustrated early chapter book series.

Keep your friends close and your enemies closer! When Snowball, the puffball hamster in Ms. Kim's classroom, accidentally sips the teacher's leftover protein shake, she transforms into a monster like Beacher Elementary School has never known before.

It's all hands on deck to stop Snowball before it's too late. And to do that, Milton Worthy is going to do have to team up with Noah, the part-time classroom ferret, full-time evil mastermind! Will Milton and Noah be able to work together in time to stop Snowball and save the world?

HarperChapters build confident readers one chapter at a time! With short, fast-paced books, art on every page, and milestone markers at the end of every chapter, they're the perfect next step for fans of I Can Read!

Alan Katz has written more than forty highly acclaimed children's books, including Take Me Out of the Bathtub and Other Silly Dilly Songs, The Day the Mustache Took Over, OOPS!, Really Stupid Stories for Really Smart Kids, and the New York Times bestseller Misty the Cloud, with Dylan Dreyer. Alan has received many state awards for children's literature, and he frequently visits schools across the country.

Alan is also a six-time Emmy-nominated writer for series including The Rosie O'Donnell Show, Taz-Mania, Pinkalicious and Peterrific, numerous Nickelodeon shows, and more. He hosted a long-running game show on SiriusXM's Kids Place Live channel, and he's also created comic books, trading cards, theme park shows, and hundreds of other special projects for kids and their parents.