Plot summary
The story takes place roughly sixteen years after the events of Far-Seer . In lieu of Afsan's discovery of the Quintaglio's real place in the universe, the Larskian faith has been abolished and worship of the Original Five hunters reinstated. Dybo is now the Emperor, with Afsan as his court astrologer, and Novato has been put in charge of the Quintaglio Exodus; a project meant to help the Quintaglios escape from their doomed world before it breaks apart. Toroca, son of Afsan and Novato, is now head of the Geological Survey of Land, meant to take a global inventory of the resources available for the Exodus project.
While undertaking the Geological Survey, Toroca finds a mysterious blue artifact, made of a seemingly indestructible material even harder than diamond. It appears to be mechanical, with moving parts, but having been found in some of the oldest rocks, is too old to have been manufactured by Quintaglios. He also begins to take notice of clues which cast into doubt his belief in the origin of the world as set forth in the book of Lubal. The world appears to be much older than five thousand kilodays, due to the rate of erosion being too slow, and during an expedition to the South Pole, he finds that it is inhabited entirely by many unique types of Wingfingers. Toroca hypothesises that they evolved from a common wingfinger ancestor.
Meanwhile, Dybo's rule has been challenged by Rodlox, the governor of the province Edz'Toolar. As Afsan had previously suspected in Far-Seer, Rodlox claims that the children of the previous Empress were exempted from the culling of the Bloodpriests, with the weakest child being made the future Emperor (as opposed to the strongest as tradition dictates) and the rest being sent away so that the royal family could be more easily manipulated. Rodlox claims that he is Dybo's brother, and that he was the strongest child and thus the rightful emperor. The Imperial Bloodpriest goes missing shortly after, his absence bolstering Rodlox's conspiracy theory. Much political turmoil follows; all across the land, Bloodpriests are driven out and sometimes killed. With no means of birth control, the Quintaglio population begins to swell eightfold as a result. With the Quintaglios' natural predisposition towards territorial aggression, it is only a matter of time before civil war erupts.
Dybo consults Afsan, his most trusted advisor, to come up with a solution for the problem. If Rodlox were to become the new Emperor, he would cancel the Exodus and doom the Quintaglios to extinction- Dybo must win Rodlox's challenge. Rather than face him in single combat, as Dybo would most certainly lose to Rodlox, Afsan suggests that all eight of the Empress' children participate in a replay of the culling, against a scaled-up Bloodpriest: a Blackdeath. Such a scenario would give Dybo a one-in-eight chance of victory. Afsan helps Dybo prepare for battle against the Blackdeath.
When Afsan finds out that one of his children has been murdered, her throat slashed open by a piece of broken mirror, he undertakes an investigation to try to find her killer. Dybo begins to train for his battle against the Blackdeath. Toroca finds himself increasingly attracted to Babnol, a member of the Geological survey team. Babnol in turn worries about Toroca's obsession with the blue artifact, and she sneaks into his cabin, steals it, and dumps it overboard. The Geological Survey team must now head back to where the original artifact was discovered, to try to find another one.
Meanwhile, back on land, the congestion has gotten unbearable. With the Bloodpriests in dispute, seven out of every eight Quintaglio hatchlings have not been culled, and the population has swelled. Tensions are boiling, and the situation explodes when mass Dagamant (a Quintaglio bloodlust fueled by territorial aggression) occurs. Many Quintaglios are killed in the ensuing battle before the situation is defused. It becomes apparent that this will happen again and again until the Bloodpriests are reinstated.
The Geological Survey team returns to the coast of Fra'Toolar, where the original artifact was found, to search for another. To speed up the process, they resort to blasting the cliffs, surmising that the mysterious blue material will not be damaged by the explosions. Their blasting exposes an enormous object made of the blue material, and after finding a mysterious double door, explore the inside. Within, they find the mummified remains of an extraterrestrial, and various creatures that are extinct on the Quintaglio's world, among them, birds.
Another of Afsan's children has been murdered. Suspicion falls upon another of Afsan's children, Drawtood. Afsan confronts Drawtood, who confesses to his crime. Suffering from paranoia, Drawtood had intended to murder all of his siblings, out of fear that they were going to come after him. Rather than face the consequences of his actions, Drawtood commits suicide, and drinks a vial of poison.
Soon, it is time for the battle against the Blackdeath. After being starved for several days, the Tyrannosaur is released into an arena, where it proceeds to devour each of the Royal siblings one by one. Rodlox does not go down without a fight, and indeed, almost defeats the Blackdeath by utilising his superior agility to disorient it. It topples over and he leaps on its back to deliver the finishing bite; however, he is killed when the Blackdeath suddenly rises to its feet and somersaults forward, crushing him with its massive bulk. Dybo has studied natural Blackdeath behavior prior to the battle, and has come up with a strategy. He positions himself carefully, with the sun setting behind him. As the Blackdeath prepares to attack, Dybo bites off its own arms, reducing them to stumps, and mimics the dinosaur's roar. In profile, Dybo resembles a juvenile T. Rex, and the Blackdeath retreats, refusing to accept a challenge from what it perceives as a lesser male. Dybo is declared the winner, and has earned the right to rule.
In the aftermath of the battle, Dybo sets about cleaning up the mess the challenge has caused. The Bloodpriests are reinstated. The Imperial Bloodpriest is found, but he has been injured; before he dies, he reveals that Dybo was in fact the weakest of the Imperial hatchlings; however, the switch was not pulled as an attempt to control the Royal family. It is revealed that because the Bloodpriests had been saving only the strongest offspring, that the Quintaglios had become too aggressive; the Bloodpriests were performing a breeding experiment with the Royal family, to try to usher in a less violent generation.
With the Imperial Bloodpriest now dead, he needs a replacement; Afsan suggests that Toroca be appointed as his replacement. With Toroca's theory of evolution, Afsan presumes that he would be the best person for the job. Dybo concurs, and assigns him to the task.
Meanwhile, Wab-Novato has finished construction on a prototype glider, based on bird remains recovered from the giant blue structure. The test flight of the machine is a success; the Quintaglios have taken their first step towards flight.
Studies on the giant blue artifact have made it apparent that is an alien starship, and that these beings brought dinosaurs and other creatures to this world from another, millions of years ago; explaining why species in the Quintaglios' fossil record appear suddenly rather than gradually. The book ends with Dybo declaring that the Quintaglios are not merely going to the stars; they are going home.
