OSF grand master McCaffrey and her son Todd combine their prodigious storytelling talents to craft a complex tale of desperation and sacrifice, love, and loss.O--"Library Journal, " starred review.

"NEW YORK TIMES "BESTSELLER
Scores of dragons are dead after plague swept across the world of Pern, and now the Weyrs are struggling to rebuild before Threadfall destroys everything--and everyone--left alive. Their best hope lies with a group of new dragonriders who have volunteered to brave the dangers of an unexplored island populated by vicious wild felines and voracious tunnel-snakes to create a safe home for their young dragons, whose offspring will hopefully replenish Pern's decimated population. But their leader, Xhinna, the first female rider of a blue dragon, faces an uphill battle to win the respect of her peers, especially after tragedy leaves the new colony reeling. The way forward seems to lie with the awesome ability of the dragons to travel through time. But that power comes with risks: By venturing into the past, Xhinna may jeopardize the very future she has sworn to save.
"Memorable characters and a good balance of individual dramas and large-scale action make this a strong addition to the Pern saga."--"Library Journal"
"Longtime fans will enjoy the latest adventures of the cheerful dragonriders and their colorful mounts."--"Publishers Weekly"
"McCaffrey will be remembered, rightly, as one of science fiction's grand masters."--Tor.com

The specter of sickness looms over the Weyrs of Pern, felling fire-lizards and threatening their dragon cousins, Pern's sole defense against the deadly phenomenon that is Thread. Fiona, the young rider of queen dragon Talenth, is about to assume the duties of a Weyrwoman when word spreads that dragons have begun succumbing to the new contagion. As more dragons sicken and die, Weyrleader B'Nik and queen rider Lorana comb Fort Weyr's archives in a desperate search for clues from the past that may hold the solution to the plague. But could the past itself prove the pathway to salvation for Pern's imperiled dragons? Guided by a mysterious ally from a wholly unexpected place, and trusting in the dragon gift for transcending time, Fiona will join a risky expedition with far-reaching consequences for both Pern's future and her personal destiny.

For millions of readers the world over, the name Pern is magical, conjuring up grand vistas of a distant planet whose blue skies are patrolled by brave dragons and their noble riders, a paradise threatened by the periodic fall of deadly Thread. But not all dangers descend from the skies. Now, in their third collaboration, Anne McCaffrey and her son, Todd McCaffrey, spin a tale of a mysterious illness that may succeed in doing what centuries of Threadfall could not: kill every last human on Pern.
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 the Hardcover edition."