[S.O.S.: Society of Substitutes 01] • S.O.S.

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!