Fires of Hell: The Alchemystic Book One by Maureen L. Mills

When her captain is murdered and her airship suffers a series of sabotages, airship engineer and rogue pyromancer, Amelia Everley, must put aside her dislike of her new employer, Josiah, and help him save her airship and crew.
But is the destruction aimed at their mysterious government passenger, or is the captain’s killer now after Josiah?
All Amelia knows is, if Josiah can’t learn to respect her skills, she may have to resign herself to working for his rival, Edmund Fairlane.
If, that is, she can bring herself, her crew, and her ship home in one piece.

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