Although many things go wrong when Froggy decides to make money by setting up a lemonade stand, he still has fun with his friends.

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

Room 3B just learned that Ida had an ancestor who sailed on the Titanic and lived to tell about it! Miss Mackle decides that she will take the class on a real riverboat trip. But has something gone wrong.

When Sid, his annoying third-grade classmate, ruins Song Lee's origami praying mantis, Horrible Harry plots triple revenge on the troublemaker.

None of Froggy's friends are home one Saturday, but that does not mean he wants to go on a movie playdate with Frogilina.

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.

On a class trip to the pumpkin patch, Froggy exuberantly picks a pumpkin in hopes of carving a jack-o'-lantern, making a pumpkin pie, and possibly winning a prize in his class's pumpkin-picking contest.

Froggy is excited for the Winter Carnival to start, and it's even more fun that he expects. He has so much fun building a snow fort and a snowman, sledding, and even having a snowball fight!

"When Froggy and his family go to visit Grandma, they have all kinds of fun!"--

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