In the skies over an alternate steampunk England, Captain Isadora Finch and her crew aboard the Valiant Sparrow face their most dangerous mission yet. The notorious Brass League has developed a weapon capable of creating devastating storms, threatening to bring Britannia to its knees. As Isadora navigates treacherous alliances, relentless enemies, and the shadow of betrayal, her unorthodox tactics and indomitable spirit are put to the ultimate test. With a genius cabin boy crafting innovative defenses, a loyal crew ready for anything, and an enigmatic inspector walking the line between ally and adversary, Isadora must outwit the League and protect the freedom of the skies. But victory comes at a cost, and in the shadows, old enemies plot their revenge.

The skies have never been more perilous—or more thrilling.