The Miocene Arrow

In the 40th century, what was once North America is hardly recognizable. The mysterious Call that lures people to their deaths and the ominous Mirrorsun that destroys large machines in the blink of an eye have kept progress at a standstill. Chivalry is the law of the land, and nobles fly against each other in dispute-settling duels. But things start to fall apart when strange visitors from faraway lands appear who seem to immune to the Call, and they are amassing an army. Can John Glasken once again avert disaster and save the world from plunging into total war?