Once, Gavin Ennock sailed the skies on airships and enchanted listeners with his fiddle music. Now, the clockwork plague consumes his intellect, enabling him to conceive and construct scientific wonders—while driving him quite mad. Distressed by her beloved’s unfortunate condition, Alice Michaels sought a cure rumored to be inside the Doomsday Vault—and brought the wrath of the British Empire down on them. Declared enemies of the Crown, Alice...