what book III is all about (summery)

Book's name:

Book III: Spirits

Summery:

10 years have passed since the war ended, avatar Yin created a glassbending nation, with their own city, bending art and moral values, the city introduced such complex architect, and modern ways to travel, live, and so much more. Republic city's mayor decided to exploit the spirit world, he started destroying it to provide energy for his city, and build a bigger and stronger army with modern technology and destructive weapons, the spirit world got heavily disturbed, and started dying and losing life.

How will the avatar stop the abuse of the spirit world?

And what will help him through this process?

A major change: this book will be written in book format, not a script.

This book is my personal favorite, it's also expected to be the longest in term of number of chapters (15) and length of each chapter, too.