In 1862, daredevil balloon pilot Amelia Wren groups up with pioneering meteorologist James Glaisher to advance human data of the climate and fly increased than anybody in historical past. Whereas breaking information and advancing scientific discovery, their voyage to the very fringe of existence helps the unlikely pair discover their place on this planet they've left far beneath them. However they face bodily and emotional challenges within the skinny air, because the ascent turns into a battle for survival.