This Halloween-themed children's learning book is all about apostrophes. Proper punctuation is very important! Use it incorrectly, and the entire meaning of a sentence can change. Possessive apostrophes have their own set of rules, depending on the singular or plural form being used. Be sure to apply your critical thinking and look out for context clues. Inside, you will discover the spooky world of possibilities that possessive apostrophes can let loose.