At the height of Britain's Industrial Revolution, steam power and magic join forces to create wonders the world has never seen. But those wonders have a dark side—one that will soon force a reckoning few could have anticipated.

Half-demon Briar is content with her structured life as an archivist, a far cry from the chaos of her background and upbringing. Briar's simple and predictable existence is rocked when she discovers something sinister powers one of the grand, new inventions of her era.

Isabella Castel, the only daughter of Viscount Sherard, is far from the brainless socialite she pretends to be. Isabella is everything Briar is not: passionate, creative and impulsive, but with secrets to rival even Briar's own. Two more unlikely partners should not exist, yet if the women cannot find a way to work together, they will lose far more than their reputations.

Can a half-demon and a debutante work past their secrets before all hell breaks loose?