Mysteries of Cove: Fires of Invention by J. Scott Savage

Mysteries of Cove: Fires of Invention by J. Scott Savage is an exciting Steampunk dystopian story about a young man named Trenton Coleman and his friend Kallista Babbage. The two kids embark on a dangerous quest to find parts for a strange machine Kallista's father left behind before he was killed in a mysterious explosion.

They're not sure what it is or why her father left them, but as Kallista says, her father always did things for a reason. The final product astonishes the kids, but in a society locked inside of a mountain to save the people from the poisoned air that invention and creativity created outside their mountain, it's kind of hard to hide what they build. Will they be able to keep their machine a secret? And what happens when they discover what their society is really hiding them from; something lurking outside the safety of their underground city?