Agatha Heterodyne And The Airship City by Phil Foglio

A headstrong young woman raised in obscurity suddenly learns she is heir to a notorious line of brilliant, volatile inventors and is thrust into a whirlwind of airships, political intrigue, and eccentric engineers; pursued by enemies and aided by unpredictable allies, she must embrace her dangerous talents, unravel conspiracies, and survive the chaotic, floating city of invention where mad science and anarchy collide.