Members of the Critter Club are all excited about their summer plans until Liz learns that, instead of taking an art class, she will have to be in summer school to improve her math skills, but a fun teacher, a classroom pet, support from her friends, and advice from her brother might get her through.

When Ellie joins a softball team, she quickly realizes that the sport is harder than it looks! Is she meant only for the stage, not the field? And what happens when Ellie goes searching in the woods near the field for a stray ball and finds an injured baby deer?!

When Marion and the other members of the Critter Club plan a ski weekend, they meet a snow bunny on the slopes, but Marion's kitten, Ollie, scares the bunny away.

"Ellie has always wanted to go to wedding, and her hopes finally come true when her cousin asks her to be a flower girl at her wedding. Then the Critter Club gets the cutest guest Ellie has ever seen: a little French bulldog. Ellie works hard to find a home for the puppy, but she's worried she won't be able to. Suddenly she has an idea that will guarantee that the puppy lives happily ever after!"--

When a broken ankle forces Marion to withdraw from the horse show, she finds a way to stay active by helping her friends at the Critter Club animal shelter find homes for a litter of kittens.

Taking a turn caring for the class pet hamster, Marion is devastated when the hamster goes missing and she receives an anonymous letter in her locker with clues leading to a mysterious scavenger hunt.

Unless Amy and her friends in the Critter Club can come up with an alternative plan, new stores are going to be built on the town's park, endangering the lives of the plants and animals living there.