The holiday season is here, and the kids in Room 3B are learning about all the different ways people celebrate. In addition to Christmas and Hanukkah, there's Kwanzaa, Three Kings? Day, Korean New Year, and more. All the talk about holidays has everyone feeling festive. Everyone, that is, except Harry. He doesn't seem to care about the holidays, the class pet, or even the new student in class. It's clear that something is bugging Harry?but what could it be?

When Harry comes to school wearing a necklace, the whole class is intrigued. Harry opens the necklace and reveals a mini-microscope&150perfect for looking at the mold experiment Room 3B is working on Everyone wants to try it, so Harry promises to show them a kingdom of mushrooms at recess. But there is one catch. They will have to go outside the playground fence, which means breaking a school rule. If they follow Harry, will they ever be able to face Miss Mackle again?

Miss Mackle's class is learning about their ancestors, and everyone just found out that Ida's great-great grandmother sailed on the Titanic-and lived to tell about it. Miss Mackle decides to take the class on a riverboat ride to help them imagine what it was like to travel on the high seas like their ancestors did. Harry and his friends are so excited-it's going to be the perfect field trip. All aboard! Room 3B is setting sail!

Illustrated by Frank Remkiewicz.

Horrible Harry and his classmates all love Halloween. Everyone wears a costume to school-even Miss Mackle. Every Halloween Harry shocks his classmates with his scary costume. In kindergarten he was a bloody Count Dracula, in first grade he was the Loch Ness Monster, and in second grade he was a slithering snake. So everyone in Room 3B can't wait to see what Harry is going to be this year-and they're in for a really big surprise!

"Fans will welcome the characters . . . #and the# classroom, where learning is as much fun as the tricks and treats!" (Booklist)

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.

Nearly every kid in Room 3B is trying to get picked for the South School Safety Patrol Squad—especially Harry. Harry wants a star badge just like his grandpa's, so he works extra hard to be the perfect student: hanging up his jacket neatly, organizing the crayons in rainbow order, and—his favorite part—cleaning up sticky noodles off the floor after lunch. But Doug thinks someone is taking the power of Safety Patrol too far, maybe even using it to cheat at the Spring Book Fair Raffle! This is Harry’s chance to stop the horrible bully and prove that he deserves a special star. Can he do it?

When Harry finds an ad in the paper for a used telescope, Miss Mackle suggests that the class raise money to buy it. The telescope will make their moon study unit even more exciting! Once they get the telescope, the class can have a nighttime moonwatch. But Harry wants to do more than watch the moon-he wants to go there! Can Harry really take a trip into outer space?

"There's laughs aplenty in the short snappy text-just the thing to turn new readers on to books." (Booklist)