It's been a year since Pledge's defeat of Turner Starling, but their victory was short-lived. As they train and fight against the darkness of the Keepers, something new and viciously powerful rises from the ashes. Unexplainable things begin to happen around Pledge and before Katana can trace it down, she and her closest friends are swept up into another adventure - one that is far more dangerous than any before it.As Katana faces down a new enemy and battles against old ones, she grows more powerful than ever before. Nothing is as she expects. But she will do anything it takes to finish this.