Thauma is the blood of the soul, a powerful force that is forbidden in a kingdom where it's mostly needed. A heir to the Throne of Anharth was murdered by the vicious dark thauma masters known as the Black Souls, and destiny entwine Marcus Springborn, a young recruit, into the chaos. But no one knows his secret: he suffers from bloodthirst, having an urge to kill whenever he loses control and that he can manipulate thauma. Can he help solve the murders of the royal family while trying to hold back his desires to kill?