The time is Storm Season on the world of Yos, when the twin suns eclipse and the planet is plunged into bitter cold. It is usually a time of quiet, when the wise lock their doors, praying for the demons of the red sun-Goddess Uros to pass them by. Yet deep in the Caverns of Maht, Hukum, the Sorcerer-Lord of cavern-dwelling Eathal, plots his Vengeance.
Cedrin, a street-wise calvanni (knife-fighter), is summoned to the secret underground tunnels of the Brotherhood of the Night. There, Cedrin is forced to join in a rebellion against the rulers of his native Athria. Caught between the threat of death and his suspicions that all is not what it seems, he must try to keep his friends alive and escape.
Ellen, daughter of the assassinated Athrian Sarlord, is named as heir before his death. She struggles to assert herself as the new ruler, little suspecting the civil war that will be unleashed on Athria within days.