What is the main conflict in The Trumpeter of Krakow by Eric P. Kelly?

The Trumpeter of Krakow plunges the reader directly into the exciting, turbulent, and darkly mysterious world of central Europe in the Middle Ages.

Poland was at the center of that world, and the Polish capital, Krakow, was at the center of Poland. The Trumpeter of Krakow is a fast-moving, adventurepacked story and, at the same time, a window into a world about which most people know relatively little.