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 first book of this hilarious, highly illustrated early chapter book series.

When Milton Worthy learns his classroom's pet ferret is the evil mastermind behind a dastardly plot for world domination, it's more than just about any kid could handle. But then not every kid is the son of a member of the super-secret, super-awesome Society of Substitutes!

Now it's up to Milton and his substitute teacher mom to save Beacher Elementary School before time runs out.

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!


S.O.S.

by Alan Katz

Published 5 January 2021

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 second book of this hilarious, highly illustrated early chapter book series.

Oh no! Noah--part time classroom pet, full-time evil mastermind--has his paws set on setting free all the animals at the city zoo.

Good thing that when there's a problem, there's no substitute for the super substitute teachers of the S.O.S.!

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!


The Zoo Switcheroo

by Alan Katz

Published 28 October 2021

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 second book of this hilarious, highly illustrated early chapter book series.

Oh no! Noah—part time classroom pet, full-time evil mastermind—has his paws set on setting free all the animals at the city zoo.

Good thing that when there’s a problem, there’s no substitute for the super substitute teachers of the S.O.S.!

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!




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!



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

It’s Field Day! Milton Worthy is Room 311B’s team captain and ready to lead the second-grade team to victory.

Little does he know, his classroom’s pet ferret is hatching yet another sinister scheme to conquer the world. Will Milton be able to save the day before his own dreams of schoolyard victory are squashed?

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!