A teen girl unravels the mysteries of a secret society and their most dangerous invention in this adventure-swept romance set in Victorian London. When a fire consumes Meg's home, killing her parents and destroying both her fortune and her future, all she has left is the tarnished pocket watch she rescued from the ashes. But this is ordinary timepiece. The clock turns out to be a mechanical key--a key that only Meg can use--which unlocks a series of deadly secrets and intricate clues that Meg has choice but to follow. She has uncovered evidence of an elite secret society and a dangerous invention that some will stop at thing to protect, and that Meg alone can destroy. Together with the handsome stable hand she barely kws but hopes she can trust, Meg is swept into a hidden world of deception, betrayal, and revenge. The clockwork key has unlocked her destiny in this captivating start to a trilogy.