Cassidy used to have a clean conscience and unstained hands. That was one hundred years ago. Today, hellish rage storms through her veins and gnawing guilt keeps her awake at nights. Thanks to her father's polluted blood, Cassidy and her sister, Harper, are Furors. Like all rage demons, death clings to them. But Cassidy is sick of living like a monster. Thankfully, she has one thing on her side: Time. It is running out. Soon, her body will slow and weaken. Soon, she will Fade from this world.

However, Harper doesn't believe in broken promises. On the night they were chased out of...