The Lord of Thunder’s sudden death leaves his daughter, Evelyn Stormbourne, unprepared to rule Inselgrau in his place. Weeks before Evie’s ascension to the throne, revolutionaries attack and destroy her home. She conceals her identity and escapes under the protection of her father’s young horse master, Gideon Faust. Together they flee Inselgrau and set sail for the Continent, but they’re separated when a brutal storm washes Evie overboard.

In her efforts to reunite with her protector and reach allies on the Continent, Evie befriends a band of nomads who roam the world in airships fueled by lightning. She also confronts a cabal of dark Magicians plotting to use her powers to create a new divine being, and she clashes with an ancient family who insists her birthright belongs to them.

If she’s to prevail and defeat her enemies, Evie must claim her heritage, embrace her dominion over the sky, and define what it means to be Heir of Thunder.