Bernadette Inez O'Brian Schwartz is back with her friends Annie, Keisha, and Megan, aka The Lunch Bunch. In this third adventure, Bernadette finally gets the puppy she has been dreaming of for so long. She asks her Lunch Bunch friends to help out at her street's garage sale to raise money to save the animals of the rainforest. When school ends, the four friends decide to go to the same day camp. Bernadette discovers that she can indulge her love of science anywhere when the local frogs go missing and she and the other campers use "scientific method" to find out why.

After her triumph at the science fair - winning a special award even though she wasn't technically old enough to enter - Bernadette is ready to continue on with grade three. Her friendship with Annie, Keisha, and Megan - also known as "the Lunch Bunch" - continues to blossom. Bernadette and Keisha befriend an elderly neighbor, Mrs. March, and help her with her garden. As a bonus they get to play with Mrs. Marsh's beautiful cocker spaniel, Lady. Could this bring Bernadette's dream of owning a dog one step closer?! Things seem like they can't get any better when Bernadette's best friend Jasmine comes to stay with her for the Christmas holidays. They visit one of their favorite haunts, the science center, and conduct an experiment where they turn snow into ice cream. But Annie, Keisha, and Megan are not as impressed. Bernadette is so happy to be spending time with Jasmine that she ignores her new friends in the Lunch Bunch. Now Bernadette has to work hard to realize her mistake, and to prove to the Lunch Bunch that she values their friendship.