When seventeen-year-old Navigator Calliope Jones and her robot World Diver leap into a whirlpool gateway to escape her nemesis, Shadowmancer Nathaniel Ormonde, she has no idea the world she discovers on the other side will be just as deadly as her enemy. 

Nebelwald is a land full of skyscraper-sized trees, man-eating monsters lurking through the forest, and mysterious, swirling Mist, a dangerous fog that swallows everything it touches. Just when it seems like she might be out of luck and lost for good, Callie meets a new friend, Soren Rykerson, a young Guide harboring secrets of his own. 

Can Callie and Soren beat Nathaniel in the race against time to find Nebelwald’s hidden thread of light, before he hunts her down a second time? Will she ever find a Seer, the only person who can help her and the World Diver make their way home? Or will she be stranded forever, surrounded by Mist, monsters, and small-town intrigue rivaling her worst high school drama?