Valyra is dying.

In less than two years, the magnificent world of eighteen oceans and four moons—and more than a trillion lives—could cease to exist.

Fifteen-year-old Mora Vale should be worried about surviving her first days at Vanguard Academy, where the next generation of Valyra’s protectors is trained. Instead, she discovers that her father, one of the planet’s leading scientists, has been hiding an impossible truth: an experiment meant to unlock a revolutionary source of energy has destabilized their world.

And the countdown has already begun.

Mora may also be the key to stopping it.

As the last descendant of Valyra’s legendary Amazons, Mora carries a bloodline tied to secrets far older than her civilization. At her side is Gray, a mysterious floating artificial intelligence who has been part guardian, part teacher, part diary—and occasionally an expert at saying exactly the wrong thing at exactly the right time.

When an ancient device opens the White Road, Mora and Gray are carried across the stars to Ardanor, a medieval world of kings, knights, forgotten ruins, and technology its people no longer understand. There, Mora discovers the Keepers: ancient machines created by a civilization that vanished tens of thousands of years ago.

And they recognize Gray.

Worse, they recognize her.

Hidden beneath Ardanor is the Refuge Network, an ancient system built to preserve entire civilizations from a mysterious force known only as the Silence. Four lost Houses once controlled the network, but the roads between them are broken, their guardians have fallen, and something has begun awakening in the darkness.

To save Valyra, Mora must uncover the truth about her bloodline, discover Gray’s forgotten past, unite two worlds that were never meant to meet, and master abilities she barely understands.

But ancient power always carries a price.

And somewhere among the stars, the Silence is coming.

A dying world. An ancient secret. One girl’s destiny.