From audible.com:

For generations, the dragonriders had dedicated their lives to fighting Thread, the dreaded spores that periodically rained from the sky to ravage the land. On the backs of their magnificent telepathic dragons they flew to flame the deadly stuff out of the air before it could reach the planet's surface.
But the greatest dream of the dragonriders was to find a way to eradicate Thread completely, so that never again would their beloved Pern be threatened with destruction.

Now, for the first time, it looks as if that dream can come true. For when the people of Pern, led by Masterharper Robinton and F'lar and Lessa, Weyr-leader and Weyrwoman of Benden Weyr, excavate the ancient remains of the planet's original settlement, they uncover the colonists' voice-activated artificial intelligence system - which still functions. And the computer has incredible news for them: There is a chance - a good chance - that they can, at long last, annihilate Thread once and for all.

From audible.com:

When the first humans came to settle the planet Pern, they did not come alone: intelligence-enhanced dolphins also crossed the stars to colonize Pern's oceans while their human partners settled the vast continents. But then disaster struck.

The deadly silver spores called Thread fell like rain from the sky, and as human colonists' dreams of a new, idyllic life shattered into a desperate struggle for survival, the dolphins were forgotten.

Now, centuries later, as the dragonriders of Pern prepare to complete the momentus task of ridding their world of Thread forever, T'lion, a young bronze rider, and his friend Readis, son of the Lord Holder of Paradise River Hold, make contact with the legendary "shipfish." And as the dragonriders grapple with the end of an era, T'lion, Readis, and the dolphins face the start of a new one: reviving the bond between land- and ocean-dwellers - and resurrecting the dreams of the first colonists of Pern.

From audible.com:

Life in the Harper Hall is busy for best friends Kindan, Nonala, and Kelsa. As the only female apprentices, Nonala and Kelsa are the butt of jokes and easy targets for the bully Vaxoram and his cronies. But when Kindan springs to Kelsa's defense, he winds up in a fight for his life against the older, bigger Vaxoram - a fight that will lead to a surprising friendship.

Meanwhile, in nearby Fort Hold, a clutch of fire-lizard eggs is about to hatch, and Lord Bemin's beautiful young daughter, Koriana, is determined to Impress one of the delightful creatures. At the hatching, Kindan Impresses a fire-lizard of his own...and wins the heart of Koriana. But Lord Bemin mistrusts harpers and will not hear of a match between his daughter and the low-born Kindan.

Then fate intervenes in the form of a virulent plague as fast-spreading as it is deadly. Arising suddenly, as if out of nowhere, the contagion decimates hold after hold, paying no heed to distinctions of birth.

In this feverish crucible, friendship and love will be tested to the breaking point and beyond. For with Threadfall scant years away, the Dragonriders dare not expose themselves to infection, and it will fall to Kindan and his fellow apprentices to bravely search for a cure and save humanity.

The price of failure is unthinkable. But the price of success may be even harder to bear.

From audible.com:

When the voice of Piemur, an apprentice at Harper Hall, changes, he has to leave the companionship of Master Shonagar behind. But his disappointment is soon replaced by a new challenge. He is to enter the service of the Master Harper himself as a rider of dragons. Soon, he embarks on a dangerous mission to the Southern Hold. The future of Pern hangs on his success.

LESSA'S
LAST CHANCE
After ten long Turns, Lessa was ready to come out of hiding, to reclaim her birthright... and to Impress the young dragon queen and become the Weyrwoman of Benden.

Suddenly the deadly silver Threads once again threatened all Pern with destruction.  But the mighty telepathic dragons that for centuries had defended Pern were now few in number, not nearly enought to protect the planet in its hour of greatest peril.  Then Lessa hatched a daring and dangerous scheme to rally support from people who had long ago ceased to exist!

From audible.com:

Young Fiona, rider of the gold queen Talenth, has returned from the past, where she and a group of dragons and riders fled so that the wounded could heal from their previous battles. Gone only three days, yet aged more than three years, Fiona is no longer a child but a woman prepared to fight against the Thread that threatens to destroy her world.

Fiona’s life takes a pivotal turn when a shocking tragedy thrusts her into a position of authority. Now she finds herself leading weyrfolk who have a hard time trusting a senior Weyrwoman who is both young and an outsider.

But even greater challenges lie ahead: Thread is falling and there are too few dragons to stem the tide. Many have died from the recent plague, and even with the influx of newly mature dragons from the past, the depleted fighting force is no match for the intensifying Threadfall. Fiona knows that something must be done, and what she proposes is daring and next to impossible. But if her plan succeeds, it just might save them all.

DRAGONFIRE
Another Turn, and the deadly silver Threads began falling again. So the bold dragonriders took to the air once more and their magnificent flying dragons swirled and swooped, belching flames that destroyed the strands before they reached the ground.

But F'lar knew he had to find a better way to protect his beloved Pern, and he had to find it before the rebellious Oldtimers could breed any more dissent... before his brother F'nor would be foolhardy enough to launch another suicide mission... and before those dratted fire-lizards could stir up any more trouble!

From audible.com:

Pellar is an orphan taken in by Masterharper Zist. Though born mute, Pellar is a gifted tracker, and when Zist sets off to take over as harper for Natalon's coal-mining camp, Pellar - along with his fire-lizard, Chitter - joins him on a secret mission of his own: to find out if reported thefts of coal are the work of the Shunned, criminals condemned to a life of wandering and hardship.
Halla is one of the children of the Shunned. Though innocent of their parents' crimes, these children have inherited their cruel punishment. Lack of food, shelter, and clothes is their lot; hope is unknown to them. And what future would they hope for? Without a hold to call their own, there will be no protection for them when the lethal Thread inevitably falls again.

Life is particularly tough for Halla. Her family gone, she must fend for herself. Yet despite the brutality of her surroundings, Halla is kind and gentle, devoted to those more helpless than she.

As depraved as Halla is good, Tenim is in league with Tarik, a crooked miner from Camp Natalon, who helps him steal coal in exchange for a cut of the profit. But Tenim soon realizes there is a lot more to be made from firestone, the volatile mineral that enables the dragons of Pern to burn Thread out of the sky. Tenim doesn't care what he has to do, or whom he has to kill, in order to corner the market.

Cristov is Tarik's son. Dishonored by his father's treachery, the boy feels he must make amends, even if it means risking his life by mining the volatile firestone, which detonates on contact with the slightest drop of moisture.

When the last remaining firestone mine explodes in flames, a desperate race begins to find a new deposit of the deadly but essential mineral, for without it there can be no defense against Thread.

From audible.com:

Young Kindan has no expectations other than joining his father in the mines of Camp Natalon, a coal mining settlement struggling to turn a profit far from the great Holds where the presence of dragons and their riders means safety and civilization. Mining is fraught with danger. Fortunately, the camp has a watch-wher, a creature distantly related to dragons and uniquely suited to specialized work in the dark, cold mineshafts. Kindan's father is the watch-wher's handler, and his son sometimes helps him out. But even that important job promises no opportunity outside the mine.
Then disaster strikes. In one terrible instant, Kindan loses his family and the camp loses its watch-wher. Fathers are replaced by sons in the mine - except for Kindan, who is taken in by the camp's new Harper. Grieving, Kindan finds a measure of solace in a burgeoning musical talent...and in a new friendship with Nuella, a mysterious girl no one seems to know exists. It is Nuella who assists Kindan when he is selected to hatch and train a new watch-wher, a job that forces him to give up his dream of becoming a Harper; and it is Nuella who helps him give new meaning to his life.

Meanwhile, sparked by the tragedy, long-simmering tensions are dividing the camp. Far below the surface, a group of resentful miners hides a deadly secret. As warring factions threaten to explode, Nuella and Kindan begin to discover unknown talents in the misunderstood watch-wher-talents that could very well save an entire Hold. During their time teaching the watch-wher, the two learn some things themselves: that even a seemingly impossible dream is never completely out of reach...and that light can be found even in the deepest darkness.

From amazon.com:

For the first time in more than three years, best-selling authors Anne McCaffrey and Todd McCaffrey, mother and son, have teamed up again to do what they do best: add a fresh chapter to the most beloved science fiction series of all time, the Dragonriders of Pern.

Even though Lorana cured the plague that was killing the dragons of Pern, sacrificing her queen dragon in the process, the effects of the disease were so devastating that there are no longer enough dragons available to fight the fall of deadly Thread. And as the situation grows more dire, a pregnant Lorana decides that she must take drastic steps in the quest for help.

Meanwhile, back at Telgar Weyr, Weyrwoman Fiona, herself pregnant, and the harper Kindan must somehow keep morale from fading altogether in the face of the steadily mounting losses of dragons and their riders. But time weighs heavily against them - until Lorana finds a way to use time itself in their favor.

It’s a plan fraught with risk, however. For attempting time travel means tampering with the natural laws of the universe, which could drastically alter history - and destiny - forever. Or so it has always been thought. But Lorana discovers that if the laws of time can’t be broken without consequences, it may still be possible to bend them. To ensure the future of Pern, she’s willing to take the fateful chance - even if it demands another, even greater, sacrifice.

From audible.com:

The beautiful planet Pern seemed a paradise to its new colonists - until unimaginable terror turned it into hell. Suddenly, deadly spores were falling like silver threads from the sky, devouring everything - and everyone - in their path. It began to look as if the colony, cut off from Earth and lacking the resources to combat the menace, was doomed.
Then, some of the colonists noticed that the small, dragon-like lizards that inhabited their new world were joining the fight against Thread, breathing fire on it and teleporting to safety. If only, they thought, the dragonets were big enough for a human to ride and intelligent enough to work as a team with a rider...

And so they set their most talented geneticist to work to create the creatures Pern so desperately needed - Dragons!

From audible.com:

Thread: deadly silver strands that fall from the sky like rain, devouring every organic thing in their path - animals, plants, and people alike. Who could believe that such a horrible thing could exist? After all, it's been 200 years since Thread supposedly fell on Pern. No one alive remembers that first onslaught. There's no sign of it anywhere in the world. Only the dragons, originally created to be a weapon against Thread, are still around to remind people that once before their population was decimated, their hopes and dreams and livelihoods almost destroyed forever.
For two centuries the dragonriders have been practicing and training, passing down from generation to generation the Threadfighting techniques learned on the fly by their besieged ancestors. And most of the Lord Holders are prepared to protect their people, to provide sanctuary, to assemble groundcrews to search out and destroy any Thread that might be missed by the dragons soaring overhead. All but one.

Even now the ominous signs are appearing: the violent winter storms and volcanic eruptions that are said to herald the approach of the Red Star and its lethal spawn. Impossibly, one stubborn Lord Holder, Chalkin of Bitra, refuses to believe - and that disbelief could spell disaster for all of Pern. So while the dragonriders desperately train to face an enemy they've never fought before, they and the other Lord Holders must find a way to deal with Chalkin and protect Bitra.

From audible.com:

Menolly has returned home and entered the Harper Hall. But her entry into the Hall proves the beginning of more troubles, and the Master Harper gives her a difficult time because she is a girl. As Menolly begins to despair, she finds help in the shape of nine bright allies.

From audible.com:

Journey to the wonder-filled world of Pern in the first volume of Anne McCaffrey's best-selling Harper Hall Trilogy. Dragonsong is the spellbinding tale of Menolly of Half Circle Hold, a brave young girl who flees her seaside village and discovers the legendary fire lizards of Pern.

All her life, Menolly has longed to learn the ancient secrets of the Harpers, the master musicians of Harper Hall. When her stern father denies her the chance to make her dream come true, Menolly runs away from home. Hiding in a cave by the sea, she finds nine magical fire lizards who join her on a breathtaking journey to Harper Hall.

Anne McCaffrey's enchanting tales of Pern, with all their colorful dragons and fantastic characters, have won her millions of fans around the world. The winner of the Hugo and Nebula Award, she is one of the best-loved writers in all of fantasy literature.

From audible.com:

In a time when no Thread has fallen for centuries - when, indeed, many are beginning to dare to hope that Thread will never fall again - a boy is born to Harper Hall. His name is Robinton, and he is destined to be one of the most famous and beloved leaders Pern has ever known.

It is a perilous time for harpers. They sing of Thread, yet more and more people are beginning to doubt the return of that deadly scourge. They teach reading, writing, history, but Fax - who hates the harpers in general - is determined to keep his growing area of influence free of the learning that might sow unrest. And they extol the dragonriders, whom many view increasingly as a drain on the resources of the Holds. Now harpers are being turned away from the holds; and, worse yet, they are being derided, attacked, even beaten.

It is the climate of unrest that Robinton will come into his own. For despite the tragedies that beset his own life, he continues to believe in music and in the dragons, and is determined to save his beloved Pern from itself . . .so that the dragonriders can be ready to fly against the dreaded Thread when it at last returns!

From audible.com:

An air of pleasant anticipation hung so thickly over the Halls, Holds, and Weyrs of Pern that it had affected even the businesslike ways of Moreta, the Weyrwoman of Fort Weyr. Her dragon, Queen Orlith, would soon clutch; spring had made a glorious debut; the Gather at Ruatha Hold was extremely merry; and Moreta was enjoying the attentions of Alessan, the new Lord Holder of Ruatha Hold.

With only eight Turns remaining before the deadly Thread would cease to Fall, all seemed well on Pern. Then, without warning, a runnerbeast fell ill. Soon myriads of holders, craftsmen, and dragonriders were dying, and the mysterious ailment had spread to all but the most inaccessible holds. Pern was in mortal danger. For, if dragonriders did not rise to char Thread, the parasite would devour any and all organic life it encountered.

The future of the planet rested in the hands of Moreta and the other dedicated, selfless Pern leaders. But of all their problems, the most difficult to overcome was time....

From audible.com:

As long as the people of Pern could remember, the Holds had protected them from Thread, the deadly silver strands that fell from the sky and ravaged the land. In exchange for sanctuary in the huge stone fortresses, the people tithed to their lord Holders, who in turn supported the Weyrs, whose dragons were Pern's greatest weapon against Thread.

But not everyone on Pern was part of that system of mutual care and protection, particularly those who had been rendered holdless as punishment for wrongdoing. And there were some, like Jayge's trader clan, who simply preferred the freedom of the roads to the security of a hold. Others, like Aramina's family, had lost their holds through injustice and cruelty. For all the holdless, life was a constant struggle for survival.

Then, from the ranks of the criminals and the disaffected, rose a band of renegades, led by the Lady Thella. No one was safe from Thella's depredations, and now her quarry was Aramina, reputed to have a telepathic link with dragons. But when Thella mistakenly vented her rage on Jayge's family, she made a dangerous enemy. For Jayge was bent on revenge - and he would never let her have the girl who heard dragons!

From audible.com:

Now that Pern can look forward to a future without the threat of Threadfall, the people are free to leave their protective stone holds and spread across more of the planet, as well as improve their lives with the newly discovered ancient technology. Not everyone is happy, though. Some resist the change, and consider anything new to be an "abomination". And the dragonriders are uncertain: without Thread, what will their purpose be in Pernese society?

Then a new danger - again from the skies - looms. Once again, the people must pull together...And turn to the only ones who can solve the crisis: the dragonriders of Pern!

From audible.com:

From the New York Times best-selling mother-and-son team of Anne McCaffrey and Todd McCaffrey comes the final installment in the riveting Pern saga that began with Todd’s solo novel, Dragonsblood. Now, with all of Pern imperiled by the aftereffects of a plague that killed scores of dragons and left the planet helpless against the fall of deadly Thread, the only hope for the future lies in the past.

There, on an unexplored island, a group of dragonriders led by Xhinna, a brave young woman who rides the blue dragon Tazith, must battle lethal Merows and voracious tunnel-snakes to build a safe home for themselves and the dragons, whose offspring will one day—if they survive—replenish Pern’s decimated dragon population. But as the first female rider of a blue dragon, and the first female Weyrleader in the history of Pern, Xhinna faces an uphill battle in winning the respect and loyalty of her peers... especially after an unforeseen tragedy leaves the struggling colony reeling from a shattering loss.

Amid the grieving, one girl, Jirana, blessed—or cursed—with the ability to foresee potential futures, will help Xhinna find a way forward. The answer lies in time... or, rather, in timing it: the awesome ability of the dragons to travel through time itself. But that power comes with risks, and by venturing further into the past, Xhinna may be jeopardizing the very future she has sworn to save.

A FANTASY
OF A TIME WHEN...
Never had there been as close a bonding as the one that existed between the daring and adventurous young Lord Jaxom and his extraordinary white dragon, Ruth.  Pure white and incredibly agile, Ruth was a dragon of many talents, though almost everyone on Pern thought he was a runt that would never amount to anything.

But Jaxom knew better, knew he could teach his dragon to fly and destroy the deadly silver Threads that fell from the sky.  Disobeying all rules, Jaxom and Ruth trained in secret.  Their illicit flights seemed but a minor disobendience - until they found themselves in the path of danger and in a position to prevent the biggest disaster of all!