Halloran Frost lives a nearly non-existent life after the death of her beloved father, and her stepmother assumes control of the Willoughby household and estate. Relinquished to living in the summer kitchen of the grand estate that once belonged to her family, Halloran's only happiness in life is the gaslight company her father founded at which is a controlling shareholder. But as time passes, she quickly discovers that her father left her much more than just the gaslight company and that living as a cinderwench to her stepmother and stepsisters is far from what her father would have wanted. Is the key to what Halloran's father wanted her to decipher locked away inside the vault at Carnaby Bank or is it just a final farewell to a daughter greatly adored?
Halloran must find the strength to follow her destiny while staying one step ahead of those who would take it from her and destroy her life forever. In a world filled with fantastic machines, steamhorses, and the power of gaslight, Halloran embarks on a dangerous quest that could change not only her life but the lives of all she loves in the process, if she can stay alive long enough to share it.