Seven-year-old Stink Moody discovers that he can get free samples by writing letters to candy companies and plans a surprise for his best friend's birthday.

Stink Moody, friends Webster and Sophie, and Mrs. Birdwistle visit tourist attractions in Virginia as they try to give away 101 guinea pigs rescued from a laboratory, although Stink is very reluctant to give away his favorite, Astro.

When it is "Backward Day," Judy must turn her usual sour mood upside down and be happy and nice for a change.

In Acton, Oregon, sisters Alex, Stevie, and Joey take turns telling about their lives, including auditioning for the same part in the school musical, baking contest-worthy cupcakes, and becoming obsessed with "Little Women."

After second-grader Stink gets an unsatisfactory grade in physical education, his parents tell him he must play a sport and so he masters thumb wrestling, as seen on a sports channel.

As Judy and the rest of the Virginia Dare Bookworms prepare for the Book Quiz Blowout competition against second- and third-grade readers, her team discovers the other group has a fourth-grader and worry about their chance of winning sets in.

After learning about slime molds during the Saturday Science Club, Stink finds the organism growing in his room and starting to take over the world.

When her substitute teacher realizes she is struggling in math, Judy is sent to a math tutor at the local college and soon is completely into the spirit of college life.

When Judy learns that some of her ancestors lived in England and possibly related to the Queen, her nemesis Jessica Finch finds more surprise relatives that Judy wishes she could hide in a dungeon somewhere.

Judy Moody's new friendship with Amy Namey causes problems with her old friends and the school project they are working on together.