A historical fantasy set in a parallel world, whose main power is the Videss Empire. In fact, the Empire is essentially borrowed by Tertledove from his beloved Byzantium—down to geography, terminology, architecture, the art of war, and many small everyday details. The plot unfolds across different centuries of the Empire’s struggle against internal unrest and external enemies—who, too, have their own historical prototypes. For instance, Makuran is a hybrid of Assyria and Persia, Halogaland is post-Viking Scandinavia, Namdalen is Norman Sicily, Vaspurakan is ancient Armenia, and so on. In Tertledove’s novels, magic takes up very little space; it is merely auxiliary (though these novels aren’t spoiled by it), while the emphasis is on politics, intrigue, and wars. Still, each subcycle has its own overriding task and idea.
At the center of the story is the emperor’s cousin, a priest named Rshava. When another civil war breaks out in Videss, Rshava begins to doubt the doctrines he defended all his life. The local dark god, Scotoc, grants the heretic powerful magic—and soon the former servant of a good god turns into a hardened villain.