It's been five weeks since Io left Alante to follow the golden thread, and she's no closer to finding the god on the other end. She spends her days in constant, grueling travel and her nights worrying over the fate-thread she shares with Edei--which seems to be fraying. Making matters worse, she and Bianca soon realize that their only lead has shaken them off, snapped the golden thread, and disappeared.

But not before Io gathers some crucial clues. Her investigation leads her to a new mystery, a rash of sibling disappearances across the Wastelands that seems to be connected to the murders in Alante. And all signs point to Nanzy, the golden city, as the center of the whole conspiracy.

As Io and Bianca make their way to Nanzy, they face powerful enemies, find allies new and old, and uncover a horrifying plot that traces back centuries. The more Io learns, the more she begins to suspect that the future of the world may truly rest on her shoulders. But she will have to determine how much of the future is her choice--and how much is simply her fate.