Dr. Lena Rostova has staked her entire career on a lost city in the Arctic. To reach it, she must hire Eva Flores, a reckless airship captain with more swagger than sense. But as treacherous skies and the unforgiving cold force them together, they discover a grudging respect that ignites into a dangerous spark. They found the impossible city, but they’re not alone, and now survival depends on trusting the one person who drives them crazy.