Harry loves creepy-crawly things. But there’s one creepy-crawly thing that even he can’t stand: head lice! So it’s a terrible day when Harry’s friend Doug discovers lice in his hair. To make matters worse, Mary makes fun of Doug for being dirty and convinces the rest of the kids in Room 3B that they can’t go near him. She claims that everything he touches is infested with lice—even the mac and cheese at lunchtime! Doug wants to run away to Siberia instead of facing his classmates South School. But Harry and Song Lee stand by him and declare battle on the bugs. Will Harry defeat the hated lice, or will Doug have to live with these horrible bugs forever?

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 isn't 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 can't distract Doug from Harry's suspicious silence. When Harry finally admits that his family is moving to a whole other town, Doug can't believe his ears. How will he survive fourth grade without his best friend?! But Harry has a more pressing question: who's that moving in to the empty house across the street from him? And what could these new neighbors mean for their friendship?

Horrible Harry is at it again in a rollicking story of Field Day adventures, mishaps...and revenge! 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 before his classmates seek Field Day revenge. Can they win and play by the rules, or will the highlight of the year be a horrible disaster?

Turnamen Triwizard akan diselenggarakan di Hogwarts. Hanya penyihir berusia di atas tujuh belas yang diizinkan ikut - namun itu tidak menghentikan Harry bermimpi bahwa dirinya akan memenangkan kompetisi. Lalu pada acara Hallowe'en, ketika Piala Api menjatuhkan pilihannya, Harry terpana mengetahui namanya adalah salah satu yang dipilih oleh piala sihir tersebut. Dia akan menghadapi tugas menentang maut, naga, dan penyihir Gelap, namun dengan bantuan sahabat-sahabatnya, Ron dan Hermione, dia mungkin berhasil lolos - tetap hidup!