Underlings: The Spark Engine - Murray Fisher

A science-fiction adventure based in the machine-powered subterranean city of Lode, where underling Evin and her mech-dog Jet face danger at every turn: a cryptic note, brutish guards, and deadly dragonsbreath fumes. Can they confront the city's deceptive leader, Cardinal Mavka, whose monstrous spark engine threatens Lode's very existence?