There are 3 books in the Mysteries of Cove series. The newest book is Embers of Destruction which came out in 2017.

1
Fires of Invention

Book cover of Fires of Invention

Trenton Colman is a creative thirteen-year-old boy with a knack for all things mechanical. But his talents are viewed with suspicion in Cove, a steam-powered city built inside a mountain. In Cove, creativity is a crime and “invention” is a curse word. Kallista Babbage is a repair technician and daughter…

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2
Gears of Revolution

Book cover of Gears of Revolution

After finding a compass and clues left by Kallista's father, Leo Babbage, Trenton and Kallista head west aboard their homemade mechanical dragon to search for the missing inventor. The two teenagers hope to find answers about their mountain city of Cove, but instead, they find only a blackened forest, ruined…

3
Embers of Destruction

Book cover of Embers of Destruction
It's time to take the battle to the dragons.

In the third and final volume of the bestselling Mysteries of Cove series, Trenton and Kallista--along with their friends, Plucky, Simoni, Angus, and Clyde--fly their mechanical dragons south toward San Francisco, looking to rescue any survivors from the battle of Seattle.…