Suzy Kline

When his best friend Doug discovers his top secret hideout, Harry enlists the help of his friends' to save it from being developed into an apartment building -- publisher

The students in Miss Mickle's third-grade class enjoy a boat trip on the Connecticut River after a class discussion of ancestors reveals that Sidney and Ida both have connections to the sea.

"Horrible Harry says goodbye in the 30th anniversary finale of a beloved series! The last day of third grade is approaching fast, but a farewell to Room 3B isnt the only goodbye Doug has to say this year. Song Lee and Mary are busy preparing an end-of-year present for their favorite teacher, Mrs. Flaubert, but their excitement cant distract Doug from Harrys suspicious silence. When Harry finally admits that his family is moving to a whole other town,...

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

It's one of the best days at South School: Field Day! That means bean bag tosses, relay races, and tug of war. When Mr. Deltoid announces students will pair up to compete for a mystery prize, Harry and Doug are determined to win. But at what cost? Harry's sneaky tactics leave Sid and Mary grumbling. They even claim he's cheating. Harry insists he's playing fair and square. Doug doesn't know what to think! He must prove his best friend is innocent...

Harry incorporates his fascination with earwigs into Miss Mackle's class project of acting out a fairy tale in front of the other third graders.

"The kids in Room 3B are asked to draw posters of things that they love, and one of them will get to share his or her poster on TV"--

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

Third grade brings lots of surprises, but one thing hasn't changed a bit—Harry and Sidney are still sworn enemies. And their relationship only gets worse when Sidney accidentally kills Harry's pet spider. But Harry comes up with a horribly funny way to get revenge during a class trip to a creepy copper mine.

Harry plots revenge against Sidney, the class tattletale, when Miss Mackle's second graders go on a field trip to the pond.