Eagle Mountain is home to survivors of the Great Comet. After the villagers find comfort in the new way of life, predators from the toxic valley air invade, decimating the farm. With no hope of another harvest, it's only a matter of time before the food stores run bare for good. The future is bleak until siblings Faith and Chance find a gift from the new world that helps their father rediscover the power of steam. For the first time in twenty years, they have the technology to venture to other mountains, unsure of who or what they will meet.