The story: The new Avatar, Korra is stuck in a encampment with the Northern tribe... until she escapes making her way to republic city. In this series she fights many of the threats to republic city and also threats to the wider world.Meanwhile she has to master all 4 elements. At the begining she has already got mastery over 3 of the 4 elements and so in book 1 she only has to master airbending . For the rest of the series she can learn things like metal bending and they can then foucus on her mental journey rather than just her mastering of the elements.