Pilot Amelia Wren and scientist James Glaisher are in an epic battle for survival as they try to make discoveries in a hot air balloon. In 1862, Amelia Wren, an adventurous pilot, teamed with pioneering meteorologist James Glaisher to advance human knowledge of the weather and fly higher than anyone in history. As they record records and advance scientific discovery, this unexpected pair discovers things both about each other and about themselves, which helps them find their place in the world they left behind. However, they face physical and emotional challenges, as the ascension becomes a struggle for survival. As the duo reaches impressive heights, the air gets drier and colder and difficult decisions have to be made that could mean the difference between life and death.