Inspired by his third-grade class's study of the moon, Harry announces that he is going there.

When Sid, his annoying third-grade classmate, ruins Song Lee's origami praying mantis, Horrible Harry plots triple revenge on the troublemaker.

Doug discovers that though being Harry's best friend in Miss Mackle's second grade class isn't always easy, as Harry likes to do horrible things, it is often a lot of fun.

"Doug is infested with the one creepy-crawly thing Harry hates: lice! Will Harry be able to help Doug get rid of them, or will Doug have to pack up and move to a new country instead?"--

Horrible Harry and friends start off third grade with a new room and a field trip to an old copper mine to study rocks.

Live ants are coming to Room 2B, and Harry gets to take care of them when they arrive. He'll get to help the teacher transfer all the ants to their new home in the classroom where everyone can watch them. Can trouble be far behind?

When Horrible Harry's pet cat, Googer, sneaks a ride and gets into the school building, third-graders Harry and Doug have to catch him before anyone else does, which means going into some forbidden places.

Harry persuades his classmates to sneak through the playground fence during lunchtime recess to view some unusual mushrooms.

It's almost summer vacation and the students in room 2B are having trouble concentrating on their butterfly project, until a frightening-looking new teacher comes to supervise the Suspension Room and Harry is sent there as punishment for unruly behavior.

First published in 1909, L. Frank Baum's "The Road to Oz" is the fifth story by Baum of the magical Land of Oz and is the Dorothy's fourth visit to this special place. Baum takes the young Kansas girl and her faithful dog Toto on a circuitous journey to Oz for Princess Ozma's birthday. Dorothy begins her adventure trying to help a stranger, the Shaggy Man, find the road he seeks. They are joined on their way by a perpetually lost boy named Button...