A century after a devastating volcanic eruption forced Iceland's inhabitants to abandon its shores, the island has become enshrouded in legend. But the truth behind the legends is mechanical, not magical—and the mystery of the island a matter of life and death for a community of women who once spilled noble blood to secure their freedom.
 
Five years ago, Annika unwittingly endangered that secret, but her sister Källa took the blame and was exiled. Now Annika serves on an airship, searching for her sister and longing to return home. But that home is threatened when scientific expedition leader David Kentewess comes aboard, looking to expose Annika's secrets. Then disaster strikes, leaving David and Annika stranded on a glacier and pursued by a madman, with their very survival depending on keeping the heat rising between them—and generating lots of steam . . .