The Doomsday Vault — Steven Harper

In a clockwork Brittania, Alice's prospects are slim. At 21, her age and her unladylike interest in automatons have sealed her fate as an undesirable marriage prospect. But a devastating plague sends Alice off in a direction beyond the pale-towards a clandestine organization, mad inventors, life-altering secrets, and into the arms of an intrepid fiddle-playing airship pilot.