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.

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 third book of this hilarious, highly illustrated early chapter book series. Oh, no! Noah, the classroom's evil pet ferret, has stolen everyone's lunch-and worse yet, he's done it on a day when Milton's mom, the class's go-to super-sub, is off on another assignment. Will Milton be able to foil Noah's most fiendish plot yet or...

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...