Daniel Locke and the Tombs of Hades by Marty Longson
Series: Black Dragon, Book 3.
Approx. 47,420 words.
Published on December 20, 2012.
Six ancient towers stand guard over the earth, protecting it from every conceivable demise... most of the time. The Tombs of Hades, designed to imprison the worst threats to earths population. What happens when a plague spreads across the planet that even the Tombs can't contain?