Follows the school activities of second-graders, Harry and Doug, as they participate in a secret mission to celebrate "Charlotte's Web," learn how to make green slime, and put on a skit warning about the dangers of smoking.

All the students in Room 2B are getting ready for Christmas. They are excited and filled with holiday spirit. But when their teacher, Miss Mackle, sits down in her chair, it breaks, and she gets hurt! Now Miss Mackle has to spend Christmas in the hospital. The students don't feel like celebrating any more. It's up to Harry to think of a present that will cheer her up and bring the holiday mood back. Will Harry find a gift that is wonderful--and horrible--enough?...

Horrible Harry's best friend, Doug, knows how much Harry loves "slimy things, hairy things, and creepy things." In Room 2B, the two classmates find plenty of exciting things to study and enjoy. Leave it to Harry, though, to always find something horrible to explore. This winter, the most horrible thing of all happens to Harry. As he watches a girl in his class feed liver to her pet water frog, Harry falls in love! Soon Harry's behavior begins to change,...

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.

Horrible Harry sets out to discover who Miss Mackle is going to marry, and he takes some risky moves to be the first one to know.

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

When the kids in Room 3B study their ancestors, they find out something amazing about Ida: her great-great grandmother sailed on the Titanic! Now Harry and his friends wish they could go to sea, too, and a field trip to a real riverboat gives them the perfect chance. An elementary school teacher for 27 years, Suzy Kline uses her classroom experiences to create wonderfully original characters and situations for her engaging books about Horrible Harry,...

Miss Mackle's third graders share December holiday traditions --Christmas, Hanukkah, Kwanzaa, Three Kings Day, and Korean New Year-- with each other and with Harry's great grandfather, who has just moved to a nursing home.

Harry and his detective classmates try to find clues relating to a mysterious locked closet in Room 3B.

Horrible Harry must defend his reputation as a detective by cracking the secret code of Mrs. Funderburke's lunch prizes.