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.

Another fun mystery starring Horrible Harry, and this time he's calling the shots! 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 go horribly wrong for the novice detectives?

Harry leads a mission to place cobwebs all over school, shows the class how to make green slime, and stages a "deadly skit" that has everyone on the edge of their seats.

Room 2B been invaded by purple people! That's what Harry is saying, but no one else believes him. Can he prove that the purple people are real?

It?s a busy time in Room 2B?an ant observation project is beginning, Miss Mackle is teaching square dancing, and class pictures are being taken. Then one of the fish from the 2B fish tank goes belly-up! Is Harry to blame?

Every Halloween Harry plays tricks on his classmates and dresses up as something scary or gross or both. He's been Count Dracula, a slimy snake and even the Loch Ness Monster. Everyone in Room 3B is waiting to see what Harry will be this year--and they're all in for a really big surprise! "There's laughs aplenty in the short snappy text--just the thing to turn new readers on to books."--Booklist for Horrible Harry and the Green Slime

Song Lee is as nice as Harry is horrible! She may seem shy, but beneath her sweet smile is a brave, spunky girl with a great sense of humor.