After learning about the American Revolution on a family trip to Boston, Massachusetts, Judy Moody makes her own Declaration of Independence and tries to prove that she is responsible enough to have more freedoms, such as a higher allowance and her own bathroom.

Seven-year-old Stink Moody, having discovered that he can get free samples by writing letters of complaint to companies, gets so caught up in his letter writing campaign that he misses his best friend's birthday, but he plans a super surprise to make up for his mistake.

When Stink discovers that Pluto has been downgraded from a planet to a dwarf planet, he launches a campaign in his classroom to restore its status to that of a full-fledged member of the solar system.

Judy and Stink prepare for this year's "Turkey Trot," with the main prize being a juicy turkey, but they worry that if they don't win, the family won't have a Thanksgiving meal.

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.

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.

"Look up! Look out! A comet is coming, a comet is coming! Stink is camped out in the backyard with his sister, Judy, and he can't wait to lay eyes on P/2015 OZ4, also known as the Sherman-Holm Comet. But then news of an asteroid hitting Russia reaches Stink, and suddenly he's feeling squeamish (and squash-ish) about close encounters of the outer-space kind. Will donning an aluminum-foil cape and building a bunker in the basement help keep him safe?...