Crown of Thunder

Lightning, espionage, and magic—Inselgrau’s fate lies in the hands of one thunder goddess with a heart of iron, one exiled spy, and one Magician haunted by chronic pain.
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Evelyn Stormbourne’s dominion over the skies has grown formidable, but she receives word from her spymaster that an old and powerful enemy has taken her throne by lethal force. To get her country back, she must free her greatest nemesis from an ancient Magical prison, and offer him as ransom for the release of Inselgrau.