In 1897 England, sixteen-year-old Finley Jayne has no one…except the "thing" inside her.

When a young lord tries to take advantage of Finley, she fights back. And wins. But no normal Victorian girl has a darker side that makes her capable of knocking out a full-grown man with one punch.

Only Griffin King sees the magical darkness inside her that says she's special, says she's one of them. The orphaned duke takes her in from the gaslit streets, against the wishes of his band of misfits. And Finley thinks she might finally be a part of something, finally fit in—until a criminal mastermind known as the Machinist threatens to tear the group apart….