After the adventures surrounding the Head of St George, Tom Swan returns to service in a Europe still reacting to the fall of Constantinople. Merchants and churchmen need reliable intelligence about Mehmed II’s next campaign, and Swan’s knowledge of languages, courts and soldiers makes him useful despite his habit of complicating every assignment.
The first stage draws him from Italian intrigue towards Hungary and the Danube frontier. Antiquities remain his preferred business, but the movement of money, weapons and agents makes it impossible to separate scholarship from the preparations for a war that may decide whether Ottoman expansion continues into central Europe.