When Harry sees Song Lee for the first time, he falls instantly in love with her and drives his best friend, Doug, crazy with all his love notes in class, secret glances, and foil-wrapped gifts.

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.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.

When his friend Doug is infested with head lice and Mary convinces everyone to stay away, Harry and his other friend Song Lee stand by Doug and declare war on the bugs.

Harry has always loved solving mysteries, and now his friends in Room 3B have learned to love it, too. So Harry challenges them to figure out what he has hidden in his giant, old suitcase. Led by a very determined Mary, the kids take turns solving clues and piecing the mystery together. Their hunt leads them from the classroom to the library, and even to Harry's grandfather's nursing home. Will they be able to solve Harry's mystery? Or will things...

As the last day of third grade looms, Doug learns that Harry is moving to a new town and wonders how he'll survive fourth grade without him, while Harry wonders about the new neighbors across the street and what they could mean for their friendship.

Herbie's friend Ray and some classmates in his fourth-grade reading group help him adjust when he moves into a new bedroom in the attic.

Marvin thinks that the new girl in class, Lucy Tinker, is a liar and a thief, but then he finds that he may have misjudged her.

When Ray decides to throw a party for his ninth birthday, in competition with another boy with the same birthday and more money, he asks his best friend Herbie to help him find an idea that is new, exciting, and free.

Orp's life becomes very complicated when he realizes that he likes two girls at the same time.

Horrible Harry, the class clown of Room 2B, returns to the spotlight with the Purple People, mysterious beings that only he can see.