Yang, Gene Luen

"After attempting to kidnap Katara and Sokka, Southerner Gilak has disappeared, leaving only a haunting note in the deserted caverns: 'Soon you will see the truth Chieftain.' The vow leaves everyone on edge and prompts Hakoda to tighten security around the city. Still reeling from the discovery that her father is romantically involved with Malina, Katara is more distrusting of the Northern newcomer than ever ... and just as everyone begins to relax their guard, Gilak's crew strikes and reveals some troubling information. Have Katara's worst fears been confirmed?"--Back cover.

When Aang leaves to aid Zuko with the Kemurikage, Katara and Sokka return to the Southern Water Tribe by themselves. Katara is shocked to find that her beloved village has become a bustling city, with none other than their father, Hakoda, in charge!.

Stately Academy is no ordinary school: it was once home to an elite institute where teachers, students, and robots worked together to unravel the mysteries of coding. Hopper, Eni, and Josh won't rest until they've learned the whole story, but they aren't the only ones interested in the school's past. Principal Dean is hot on their trail, demanding that the coders turn over their most powerful robot. Dean may be a creep, but he's nothing compared to the guy who's really in charge: a green-skinned coding genius named Professor One-Zero.

There's something lurking beneath the surface of Stately Academy literally. In a secret underground classroom Hopper, Eni, and Josh discover that the campus was once home to the Bee School, an institute where teachers, students, and robots worked together to unravel the mysteries of coding. Hopper and her friends are eager to follow in this tradition and become top-rate coders. But why are Principal Dean and the rugby team suddenly so interested in their extracurricular activities?.

While trying to discover what happened to his mother, Fire Lord Zuko learns something that makes him question everything. His insane sister, Azula, turns the situation to her advantage as she travels with Zuko and his friends Aang, Katara, and Sokka.

"Avatar Aang travels to the spirit world to parlay with an ancient power, bringing Fire Lord Zuko ever closer to discovering the truth about his mother's fate--and his own past. Yet Zuko's sister Azula is becoming increasingly dangerous, threatening to ruin everything that Zuko, Aang, Katara, and Sokka have struggled to achieve on their search"--Back cover.

"As Avatar Aang and his friends confront an ancient spirit determined to destroy a town on land sacred to the Air Nomads, Toph and Aang find themselves on opposing sides in a battle of gigantic proportions."--Back cover.

"Dr. One-Zero has added a new class to Stately Academy's curriculum. But in 'advanced chemistry' they only teach one lesson: how to make Green Pop! While their classmates are manufacturing this dangerous soda, the Coders uncover a clue that may lead them to Hopper's missing dad. Is it time to use Professor Bee's most powerful weapon: the Turtle of Light?"--Back cover.

"Welcome to Stately Academy, a school which is just crawling with mysteries to be solved! The founder of the school left many clues and puzzles to challenge his enterprising students. Using their wits and their growing prowess with coding, Hopper and her friend Eni are going to solve the mystery of Stately Academy no matter what it takes!"--Amazon.com.

The founder of Stately Academy left many clues and puzzles to challenge his enterprising students.