While continuing to help his classmates solve their problems, Humphrey, pet hamster of Longfellow School's Room 26, faces many surprises, like rolling in a hamster ball, a substitute janitor who might be an alien, and the possibility of Mrs. Brisbane retiring.

Jason Reynolds conjures ten tales (one per block) about what happens after the dismissal bell rings, and weaves them into one funny, poignant look at the detours we face on the walk home, and in life.

Each of the girls in a middle-school clique reveals the strong, manipulative hold one of the group exerts on the others, and the hurt and self-doubt that it causes them.

"Link, Michael, and Dana live in a quiet town. But it's woken up very quickly when someone sneaks into school and vandalizes it with a swastika. Nobody can believe it. How could such a symbol of hate end up in the middle of their school? Who would do such a thing? Because Michael was the first person to see it, he's the first suspect. Because Link is one of the most popular guys in school, everyone's looking to him to figure it out. And because Dana's...

Fearing that her legal guardian plans to abandon her to return to France, ten-year-old aspiring scientist Lucky Trimble determines to run away while also continuing to seek the Higher Power that will bring stability to her life.

When seventh-grader Jake McQuade mistakes the world's first ingestible knowledge pills for jelly beans, he suddenly knows all about physics and geometry and can speak Swahili (though Spanish would be a lot more useful)--but his sort-of girlfriend Grace thinks they can use his new found brilliance to save their middle school from the new principal, who is conspiring to get it shut down.

Chase does not remember falling off the roof, in fact he does not remember anything about himself, and when he gets back to middle school he begins to learn who he was through the reactions of the other kids--trouble is, he really is not sure he likes the Chase that is being revealed, but can he take the opportunity amnesia has provided and restart his life?

"Olive and Willow are happy campers! Or are they? Olive is sure she'll have the best time at summer camp with her friend Willow - but while Olive makes quick friends with the other campers, Willow struggles to form connections and latches on to the only person she knows - Olive. It's s'more than Olive can handle! The stress of being Willow's living security blanket begins to wear on Olive and before long ... the girls aren't just fighting, they may...

As a new member of the Baby-sitters Club, Dawn tries to win the acceptance of the club's president by tackling a tough babysitting job.

In this final book in the series, the seventh graders of McQuarrie Middle School and their Star Wars-inspired Origami finger puppets go on a field trip to Washington, D.C., on what proves to be a very long trip full of shifting alliances, betrayals, carsickness, and sugar rushes.