Korra and Team Avatar embark on a new journey deep into the mythology of the mystical Spirit World, encountering creatures like nothing they've seen before and discovering the truth about the very first Avatar! With a battle for the fate of the world between the light and dark spirits Raava and Vaatu fast approaching, Korra delves deeper into the Avatar's past and realizes what she must do in order to restore balance between the physical and spirit...

An exploration of how the actions of individual lives impact one another in the past, present, and future, as one soul is shaped from a killer into a hero, and an act of kindness ripples across centuries to inspire a revolution. The story is a time-shifting weave of six interlinking narratives with diverse settings, from the savagery of a Pacific Island in the 1850s to a dystopian Korea of the near future.