Shortly after the conclusion of [[EarthThatWas a war that destroyed the Earth, rendering it uninhabitable for generations]], the survivors in the grossly-overstretched lunar colony decide to send four thousand in a colony ship to a planet that had been in the process of being terraformed. However, the colony ship was only designed to carry one thousand -- and the other three thousand replace the supplies that the colony would have needed to start on the new planet as a technological civilization. The colony will survive ... but they will survive as a ''low-tech'' civilization that will have to rebuild to a higher level. And to help them, they will begin the job [[BrainwashingForTheGreaterGood implanted with a strict religious code, designed to maximize the probability of the colony's survival.]]

[[TimeSkip Generations later]], the story resumes on the now-terraformed planet with Leland de Laal, the youngest son (at just under seventeen) of the high steward of the prosperous house of Laal, defying the proclamation of his father to climb a granite pillar to reach the legendary Glass Helm that sits atop it -- a choice which will thrust him into the midst of machinations far beyond his prior imaginings.

Written by Steven Gould, the author better known for writing the book ''Literature/{{Jumper}}''. Falls in the Mohs/SpeculativeScience class on the MohsScaleOfScienceFictionHardness -- several of the technologies used in the story are fictional, but none of them are in any way ruled out by present scientific knowledge.
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!!This book provides examples of:

* ApocalypseHow: A planetary Class 3: life on Earth suffers something just shy of total extinction due to antimatter bombs dropped during a war.
* BadassBookworm: Leland, who had spent almost all his spare time prior to donning the Helm in the library, reading.
* {{Bookends}}: [[spoiler:The first chapter of the book is the survivors of Earth sending a colony ship to Agatsu. The last chapter is a report, sent back to Earth, that the colony is successful.]]
* BornInTheSaddle: The culture of the Rootless clans lays great importance on their horses, and they are generally judged to be well superior to Noramlanders like the Laals in fluid cavalry duels.
* {{Brainwashed}}:
** First, on Earth, the impetus for the earth-destroying war was the use of imprinters to force religious conversions.
** Second, under the category of BrainwashingForTheGreaterGood, the use of imprinters on the colonists.
** Third, [[spoiler:the use of the Helm, which was the last of the surviving imprinters, by Sigfried of Cotswold after capturing Laal Station to [[InstantAllegianceArtifact convert key persons into traitors for his side]].]]
* CasualDangerDialog: Leland engages in this with [[spoiler:Marilyn]] while [[spoiler:retaking Laal Station]].
* ChekhovsGun: The nook in Laal's library that Leland shows Marilyn.
* DeadlyDodging: Leland learns this during his TrainingFromHell.
* DoubleMeaning: When Denesse Sensei meets Leland, everything he says about the steeping of the tea is simultaneously a comment on Leland's absorption of the [[UpgradeArtifact effects of the Helm]].
* EarthThatWas: After the war.
-->The temperature at Earth's equator hovered around 4 degrees Centigrade. Snowstorms and high-altitude dust clouded the planet.
* EveryoneCanSeeIt: Apparently, [[spoiler:Leland and Marilyn]].
-->'''Margaret de Noram:''' Don't you see it? It's plain as rocks to anyone else. You both sit in the same room trying so hard to ignore the other's presence that it's obvious you both want -- no, ''need'' to talk to each other.
* ExactlyWhatItSaysOnTheTin: Leland's mounted infantry unit, The Eight Hundred.
* FantasyGunControl: All explosives have been outlawed on Agatsu by general agreement.
* HeroicSacrifice: [[spoiler:Ricard de Laal]], when he is ambushed at the inn.
* HorseArcher: Many, but it is widely agreed that the Rootless are the best.
* HumanPopsicle: The settlers, being transported to Epsilon Erdani II from the Moon.
* OldMaster: Dr. Michaela Herrin, akido expert.
* OutGambitted: [[spoiler:Arthur de Noram]], trying to scheme with [[spoiler:Siegfried Montrose]] -- and both of them versus [[spoiler:the de Laals, pater et filius.]]
* PregnantHostage: The post-climactic confrontation involves [[spoiler:Sylvan Montrose]] choosing a pregnant girl from among 20 hostages and holding a dagger to her throat. But she's ''very'' pregnant--so much so that her water breaks during the showdown, startling the bad guy into a human reaction that momentarily shakes up his screw-em-all villainy.
* ReluctantWarrior: Leland becomes this when he is made captain of a unit of eight hundred soldiers. He spends a fair amount of time mourning the deaths even of [[spoiler:enemy soldiers invading his homeland]].
* TheSoCalledCoward: Leland.
-->'''Dulan:''' [''wrapping up a description of Leland's foibles''] He does pursue whatever interests him with a passion. But he never stands up for himself.\\
'''Malcolm:''' Oh? Is he beaten regularly?\\
'''Dulan:''' No, he backs away whenever there is any sort of confrontation.\\
'''Malcolm''' [''smiling'']: Maybe he knows more about fighting than you think.
* SpaceStation: The moon base, designed for six hundred, holding -- prior to the colony's departure -- seven thousand.
* TakeOverTheWorld: Siegfried's ambition.
* {{Terraform}}: Epsilon Erdani II -- Agatsu -- is terraformed prior to the colony's landing.
* TrainingFromHell: Dulan de Laal subjects his son Leland to this after Leland wears the Helm.
* TreacheryCoverUp: [[spoiler:Arthur de Noram]] is permitted to retire rather than be revealed as [[spoiler:the one who allowed Cotswold to invade Laal]].
* UpgradeArtifact: The Helm. Unusually, it does ''not'' induce {{Instant Expert}}ise.