Middle-schooler Greg Heffley nimbly sidesteps his father's attempts to change Greg's wimpy ways until his father threatens to send him to military school.

When Miss Know-It-All's inbox overflows with pleas for guidance, Nikki Maxwell, the school newspaper advice columnist, turns to her best friends for help.

Nikki's diary describes a frightful Halloween, on which she helps with her sister's ballet class party at the same time she is Brandon's date for their middle school Halloween dance, where she has promised to spend the evening with her two best friends.

Middle-schooler Nate Wright vies against his rival, the "perfect" Artur, to win the grand prize of a customized skateboard in their scout troop contest.

"Fifth-grader Sammy Hayes-Rodriguez struggles to fit in when his inventor mother requires him to take her latest creation, a robotic 'brother,' to school with him to learn to become a student"--

Harvey, upset when his Darth Paper finger puppet brings humiliation, gets Dwight suspended, but Origami Yoda asks Tommy and Kellan, now in seventh grade, to make a new casefile to persuade the School Board to reinstate Dwight.

The Unteachables are a notorious class of misfits, delinquents, and academic train wrecks. Like Aldo, with anger-management issues; Parker, who can't read; Kiana, who doesn't even belong in the class - or any class; and Elaine (rhymes with pain). The Unteachables have been removed from the student body and isolated in room 117. Their teacher is Mr. Zachary Kermit, the most burned-out teacher in all of Greenwich. He was once a rising star, but his...

While trying to find a new best friend after feuding with Rowley, middle-school slacker Greg Heffley is warned by older family members that adolescence is a time to act more responsibly and to think seriously about his future.

Resolving to become the world's greatest stand-up comedian despite less-than-funny challenges in his life, wheelchair-bound middle school student Jamie Grimm endures bullying from his mean-spirited cousin and hopes he will be fairly judged when he enters a local comedy contest.

Ten-year-old Auggie Pullman, who was born with extreme facial abnormalities and was not expected to survive, goes from being home-schooled to entering fifth grade at a private middle school in Manhattan, which entails enduring the taunting and fear of his classmates as he struggles to be seen as just another student.