The Fae are real—this is a fact that Aisling Morrow has believed since she was a child. Her late mother's accounts of their beauty still linger in her mind, but with the caveat: Do not involve yourself uninvited with matters of the Fae. Aisling has no plans to do so—until she discovers a prophecy which names her the Red Woman, destined to turn the tides of war in Wyldraíocht by ensuring the fall of the Unseelie Court.

On a quest to understand, Aisling ventures into Wyldraíocht. Except Fae prophecies aren't easily interpreted, and she is soon ensnared in a dangerous web—at the center of which stands the vengeful Unseelie King.

King Kael Ardhen, a vessel for power bestowed upon him by an eldritch god, is consumed by his own rage—a rage which he would not hesitate to turn on the human prophesied to destroy his court. Yet something about the way Aisling calls to his shadows draws him in.

As unsettling truths challenge Aisling's convictions and call into question the purpose of the Red Woman, the Veil between realms grows weaker. Soon, the crueler sorts of Fae will no longer be confined to Wyldraíocht. With time running out, Aisling finds herself at the crossroads of fate and choice.