War with the terrible Obsidian King. Mika and the disgraced Lord Caleb pursued the bearer of a dangerous secret across the Windfast Empire. When they fail to capture the host, they are forced to venture into the heart of enemy territory. In the mysterious Obsidian, they meet an unexpected ally with a mission. They will have to work together for compelling copy. But there's more going on in the alien kingdom than they thought—and the traitor could be anyone.Can Mika complete her mission before the Obsidian king conquers her homeland? Or will a tyrant use the secret to destroy everyone she loves?