Rome 549 AD. Forced to flee the city, merchant Nicander and legionary Marius escape to a new life in Constantinople. Determined to make their fortune, they plot a number of outrageous money-making schemes, until they chance upon their greatest idea yet. Armed with an audacious plan to steal precious silk seeds from the faraway land of Seres, Nicander and Marius must embark on a terrifying and treacherous journey across unknown realms. But first...