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 and Doug investigate when special bookmarks begin to disappear while their class is busy studying poetry and running their own post office.

The students in Miss Mackle's third-grade class enjoy a day of Halloween surprises, including Harry's unusual costume.

Jill goes along with the rest of the fifth-grade class in tormenting a classmate and then finds out what it is like when she, too, becomes a target. {28}Blubber is a good name for her,

A traumatic event near the end of the summer has a devastating effect on Melinda's freshman year in high school.

Horrible Harry falls in love with Song Lee, and Harry's best friend, Doug, can't stand all that mush.

When the origami pig that Song Lee made for her grandmother is seized by a substitute teacher, the usually well-behaved third-grader breaks a classroom rule to rescue it from the "June box."

"When Sarah Taylor arrives at the exclusive St. Ambrose School, she's carrying more baggage than just what fits in her suitcase. She knows she's not like the other girls--if the shabby, all-black, non-designer clothes don't give that away, the bottle of lithium hidden in her desk drawer sure does. St. Ambrose's queen bee, Greta Stanhope, picks Sarah as a target from day one and the most popular, powerful, horrible girl at school is relentless in making...

To his great surprise, uncool eleventh-grader Max Cobb is invited to join the Chaos Club, an exclusive group of students responsible for some of the biggest pranks at his high school.

While Harry's third-grade class is studying birds, the cold winter weather keeps them cooped up inside during recess and Harry gets restless.