The Agility of Clouds: Volume One of the Helleborine Chronicles

Forced to spy for King George II of England by the scheming Lord De La Warr, Lady Seramis Helleborine faces the most dire enemy of all: Father Time.

Of course, her enemies hadn't counted on opposition from one of the most brilliant minds of the eighteenth century as she pursues justice across the skies in her improbable airship, The Agility of Clouds.