In 1974 local farmers outside Xi'an, China, discovered an army of more than 8,000 life-sized ancient terracotta warriors buried in a series of pits. Historians believed that the warriors were placed there to guard the mausoleum of Qin Shi Huang, the first Emperor of China.

But the terracotta army was also there for a second, and much more secret reason: they were there to prevent the evil buried within from ever surfacing again.

Now Sam Reilly must disentangle fact from fiction, and discover what ancient danger has been uncovered. . .

. . .and if there was any way to stop it.