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Anne McCaffrey
Introduction
Ours not to ponder what were fair in Life；
But； finding what may be；
Make it fair up to our means。
When mankind first discovered Pern； third planet of the sun Rukbat； in the Sagittarian Sector； they paid little attention to the eccentric orbit of another satellite in the system。
Settling the new planet； adjusting to its differences； the colonists spread out across the southern； most hospitable continent。 Then disaster struck in the form of a rain of mycorrhizoid organisms； which voraciously devoured all but stone； metal； and water。 The initial losses were staggering。 But fortunately for the young colony； 〃Thread；〃 as the settlers called the devastating showers； was not entirely invincible： both water and fire would destroy the menace on contact。
Using their old…world ingenuity and genetic engineering； the settlers altered an indigenous life…form that resembled the dragons of legend。 Telepathically bonded with a human at birth； these enormous creatures became Pern's most effective weapon against Thread。 Able to chew and digest a phosphine…bearing rock； the dragons could literally breathe fire and sear the airborne Thread before it could reach the ground。 Able not only to fly but to teleport as well； the dragons could maneuver quickly to avoid injury during their battles with Thread。 And their telepathic munication enabled them to work with their riders and with each other to form extremely efficient fighting units…wings。
Being a dragonrider required special talents and plete dedication。 Thus the dragonriders became a separate group； set apart from those who held land against the depredations of Thread； or those whose craft skills produced other necessities of life in their Crafthalls。
Over the centuries； the settlers forgot their origins in their struggle to survive against Thread； which fell across the land whenever the Red Star's eccentric orbit coincided with Pern's。 There were long Intervals； too； when no Thread ravaged the land； when the dragonriders in their Weyrs kept faith with their mighty friends until they would be needed once more to protect the people they were pledged to serve。
After one such long Interval； when Thread renewed its violence； the dragonriders were down to one single Weyr： Benden。 Its courageous Weyrwoman； Lessa； rider of the only gold queen； Ramoth； discovering that dragons could move through time as well as space； took a desperate gamble and flew four hundred Turns into the past to bring the other five Weyrs forward in time to renew the defense of Pern。
Circumstances encouraged exploration of the southern continent and there Lord Jaxom； rider of white Ruth； his friend； F'lessan； rider of bronze Golanth； Journeywoman Jancis from the MasterSmithcrafthall； and Piemur； Harper at large； discovered the most important artifact in the settlers' original Landing： AIVAS…Artificial Intelligence Voice Address System。
With the myriad files of information that the colonists had brought with them； Aivas was able to restore lost pieces of information for all the Crafthalls。 He was also able to teach them how to rid their world of the cyclical dangers of the erratic satellite； inaccurately called the Red Star。
F'lar and Lessa； Benden's courageous and far…seeing Weyrleaders； were the first to encourage Lord Holders and Craftmasters to end the domination of Thread and start a new era on Pern。 Almost all Lord Holders and Craftmasters agreed； especially since Aivas could provide them with new methods and technologies for improving health and quality of life。
Those who considered Aivas an 〃abomination〃 attempted to stop the splendid project； but were defeated。 Instructed and trained by Aivas； the young riders and technicians were able to transport； by means of the dragons； the antimatter engines of the three colony ships…still in orbit above Landing…and place them in a massive fault on the Red Star。 The subsequent explosion was visible from much of the planet； and people rejoiced to think they would finally be rid of Thread。
Now； though； Thread continues to fall； because the swarm already brought in by the Red Star has not yet pletely passed by Pern。 Dragonriders and harpers have explained to those who would listen that this Pass is the last one Pern will have to endure。
They must now start planning for a Threadfree future； making use of the Aivas files； full of helpful but not overly sophisticated technology that will improve life for everyone on Pern。 Even the dragonriders； for centuries the defenders of Pern； must fit themselves for new occupations。 The questions are： Which technologies can be adopted without disrupting the culture of the planet？ And how will the dragonriders integrate themselves and their splendid friends into the new Threadfree society？
Prologue
CROM MINES…5。27。30…PRESENT PASS AIVAS ADJUSTED RECKONING…2552
The journeyman on duty in the prisoners' quarters at Mine 23 in the western foothills was the first one to see the bright； almost bluish streak in the sky。 It was ing from a southwesterly direction。 It also appeared to be ing straight at him； so he shouted a warning as he scrambled down the steps of the guard tower。
His yells attracted the attention of other miners； just ing up from the shafts； tired and dirty from a long day of digging iron ore。 They； too； saw the light…ing straight at the hold。 They scattered； yelling； diving for the nearest shelter under ore carts； behind the raw mounds of the day's tips； the gantry； back into the shaft。 There was a rushing noise of thunder rumbling from the sky…and not a cloud in sight。 Some insisted that they heard a high…pitched shriek。 Everyone agreed on the direction from which the object came： southwest。
Suddenly the high stone wall that surrounded the prison yard was breached； showering pieces of rock that rained down on the other sections of the minehold and causing miners to fall flat； covering their heads against the fragments。 A second explosive noise followed the first； punctuated by screams of terror from those in the prison quarters。 There was the stink of very hot metal； a familiar enough smell in a place where iron ore was smelted into ingots before being shipped to Smithcrafthalls…only this stink had an unusual acidity that no one could later accurately describe。
In fact； from the moment the journeyman shouted his warning； only one man of the several hundred in the minehold kept his head。 Shankolin； imprisoned in the Crom mines for the past thirteen Turns； had waited for just such an opportunity： a chance to escape。 He heard the wall shatter； of course； and saw a moment's reflection of the blue…white light in the small window of the heavy door that was the only entrance to the building。 He threw himself to the left； diving under a wooden bunk just as something large； hot； and reeking pierced the wall where his head would have been。 It hissed as it plowed down the main aisle and buried itself in the far corner； dropping through the wood planks； smashing a corner pillar； buckling the wall； and causing part of the roof to collapse。 Someone was screaming in pain； pleading for help。 Everyone else was howling with fear。
Wriggling out from under the bunk； Shankolin took just one look at the opening made by the meteorite…for that was the only thing that could have caused the damage just done…and； realizing that he could see straight across the yard to the shattered wall； he reacted instantly。 He dove out of his prison and sprinted to the broken wall。 On his way； he made certain that there was no one on the guard walkway or in the end turrets。 They must all have abandoned their posts as the meteor streaked toward the minehold。
He heaved himself up and over the broken wall and ran down the hill as fast as he could to the nearest cover of straggly bushes。 Crouching behind them； he caught his breath while he listened to the continued sounds of confusion from the minehold。 The injured man was still howling： the guards would have to tend to him before they did a head count。 They'd probably want to have as close a look at the meteorite as possible。 The metal types were valuable。 Or so he'd heard； once his deafness had lifted。 He didn