The kids help an anthropologist find a spirit's lost library in the middle of a desert, where Sokka hopes to discover powerful secrets to use against the Fire Nation.
9.1
"Superb"
In a prairie, Aang sit on the ground playing notes on a flute. As he plays, multiple groundhogs pop out and back into of the ground, reciting each note accordingly. It isn't long before Sokka gets fed up and puts and an end to this recital, stating that they have more important things to be doing and plans to be making. While his fellow group members all agree to take a little "mini-vacation" as a way to unwind after all the work they've done, Sokka thinks the group should instead be working towards gaining intelligence on the Fire Nation, more specifically a map for when Aang must eventually confront the Fire Lord. Katara agrees that they should and will do intelligence some gathering--after the next vaction. It also happens to be her turn to pick their next vacation spot. When given a map, she chooses a place called the Misty Palms Oasis, which according to Aang, is pristine natural ice spring and one of nature's wonders.
However, the vacation soon changes direction when the oasis turns out to be a small, walled desert village, ironically devoid of any plant life and filled with mud houses, with a barely visibly, melted iceberg in the center.Nevertheless, the group ventures into the oasis's cantina, passing three young men wearing light brown clothing and wrapped in rags loitering just before the entrance, one of which spits at Sokka's feet. Inside, Aang accidentily bumps into a customer, causing the man to spill his mango drink all over his shirt. Unaffacted, Aang swiftly uses a contained gust of air to dry his clothes, exposing his Air Nomad origin. Both awed as well as fascinated by this discovery, the man introduces himself as Professor Zei, head of anthropology at Ba Sing Se University. Seeing as he must be a well-traveled person, Sokka asks the professor if he possesses a map. Zei produces one, but much to his dismay, unfortunately doesn't contain any territory of the Fire Nation. However, Zei goes one to tell them that he is searching for a legendary library said to be in the middle of a nearby desert; the library, said to have been created by the spirit of knowledge and his fox servants, has more valuable tomes than any other place in the world. Sokka, enthusiastic that he may be able to get information on the Fire Nation there, and seeing that it just so happens to be his turn, dedicates his "vacation" to finding the lost library.
With Appa's aerial abilities, the group is soon able to find the library, utterly buried in the sand, save its single, highest tower. After seeing a fox run vertically up the spire and through a window, Aang, Katara, Sokka, Momo and Professor Zei follow suit and use the window to enter the library; Appa stays outside, of course due to his size as well as his distaste of being underground, as does Toph, who cannot read since she is blind. Toph also mentions that, because of the loose desert sand, she has difficutly feeling the vibrations in with her feet as well as she normally can with solid ground, making her lose her usual advantage.When the group descends into the library, they are confronted by the suspicious spirit, Wan Shi Tong, who originally constructed the library and takes the form of a large owl. The spirit, apparently dislikes the fact that humans seek and use knowledge solely to obtain an advantage over other humans, going on to bring up the last human to have discovered his library, who happened to be Admiral Zhao (Zhao mentions a library in "The Siege of the North"), and states his belief the group only wants to get information to help them defeat their enemies (which is, of course, true). Making use of Aang's Avatar title as a vouch, Sokka shakely manages to convince the spirit to let them in, however, and each find a bit of knowledge to contribute to the library (the professor's first edition book, Katara's waterwhip waterbending scroll, Aang's wanted poster, and Sokka's butterfly knot). The group is then allowed and proceed to go searching for information in the vast collection of tomes.
After collecting various books and tomes, Sokka finds an encased burned document that mentions "the darkest day in Fire Nation history;" it has a date but no other information. Hoping to uncover more towards the subject, the group heads down towards the Fire Nation wing. Unfortunately, it turns out that Zhao, before leaving, apparently destroyed every other bit of information about the Fire Nation. However, one of the Knowledge seekers comes across the group, and leads them to a large, dome-shaped room dedicated to astronomy. There, a date can be entered on a stone pedestal filled with dials, which then displayes the precise coordinates of the heavens on that particular date. When Sokka enters the date of "the darkest day," it shows a solar eclipse occurring. Though still unaware of what happened on that day, the group is able to come to the conclusion as to why: solar eclipses must weaken or take away their firebending, in the same way lunar eclipses affect waterbending. They also realize that the information can be used to plan a devastating attack on the Fire Nation forces.Soon, however, Wan Shi Tong appears with his all suspicions confirmed. The knowledge decrees that he will never again allow humans to misuse his beloved information and with violent flaps of his wing, begins to submerge the library. Outside, Appa makes a drowsy Toph aware of the sinking library, who then begins to strain to hold up the tower using her earthbending. However, at the same time the "Sandbenders" from before arrive and attack. The desert tribesmen quickly make it apparent that they have come to abduct Appa. Toph initially attempts to stave off the abductors, but soon finds it impossible to hold up the massive library for her friends' escape and simultaneously fight off Appa's assailants. In the end, the Sandbenders are able to overpower and with off with Appa.
Inside the library, Aang and Sokka hurriedly try to use the planetarium room to find the next date of a solar eclipse before the library submerges completely. After numerous tries, the two are able to find the next one, which turns out to be only a few months away. The group then quickly escapes. Professor Zei decides to remain with his life's work than to see it vanish forever; the others have no choice but to leave him. Aang, Sokka and Katara escape just before Toph gives in and the library vanishes into the sand. Looking around, Aang notices that Appa is missing and questions this. Toph merely groans and somberly shakes her head, as tears begin to roll down Aang's cheek.