Sybil Delling has spent nine years dreaming of having no dreams at all. Like the other foundling girls who traded a decade of service for a home in the great cathedral, Sybil is a Diviner. She sleeps, and dreams of seven unearthly figures known as Omens. From them, she can predict terrible things before they occur, and lords and common folk alike travel across the kingdom of Traum’s windswept moors to learn their futures by her dreams.

But just as she and her sister Diviners near the end of their service, a mysterious knight arrives at the cathedral, and Sybil dreams of a moth—the death Omen. Then, one by one, the Diviners begin to vanish.

To find them, Sybil enlists the knight’s help. But the world outside the cathedral’s cloister is wrought with peril. The seven Omens are not merely figures that visit her wakeless mind—they are real. Ancient, sorcerous, and cunning, Sybil must face each of them to recover the lost Diviners. And the knight, with whom she has become inextricably entangled, may be one of them.