In 1862, daredevil balloon pilot Amelia Wren teams up with pioneering meteorologist James Glaisher to advance human knowledge of the weather and fly higher than anyone in history. While breaking records and advancing scientific discovery, their voyage to the very edge of existence helps the unlikely pair find their place in the world they have left far below them. But they face physical and emotional challenges in the thin air, as the ascent becomes a fight for survival.

Free-spirited writer Juliet Ashton forms a life-changing bond with the delightful and eccentric Guernsey Literary and Potato Peel Pie Society, when she decides to write about the book club they formed during the occupation of Guernsey in WWII.