Four friends – Amy, Ellie, Marion, Liz – have created a club to help "critters" such as pigs, puppies, mice, chickens, and cats. Amy's mother, a veterinarian, is instrumental in helping the girls with their adventures at the Animal Rescue Center in Santa Vista.
Each book features one of the four friends but all four girls are in each book. The Critter Club has problems to solve and they always find a good solution. In Amy on Park Patrol, the girls work to keep the town park for animals—not more stores. The girls help find a home for Plum the Pig in Ellie and the Good-Luck Pig. The girls start a pet sitting service – Critter Sitters – in Liz Learns a Lesson.
This is a great series for a reader who loves helping animals! Each book in the series of 18 books (so far!) is about 120 pages with black and white illustrations on most pages (book 1 is Amy and the Missing Puppy). Sparkles on some of the paperback covers add to the charm of the stories. The Lexile scores range from 460-630.