In nineteenth-century Boston, a young doctor on the run from the law falls in with a British confidence artist. Together–and with dire consequences–they bring back to the light something meant to be forgotten.

A world away in London, an absent father, haunted by the voice of a banished angel, presents his daughter with an impossible friend–a clockwork ballerina.

For two centuries, a bullet-removal specialist has wielded instruments of angel bone in service to a forgotten power . . . and now he vows to find someone else to shoulder the burden, someone with a conscience of their own, a strong mind, and a broken will. For a hundred years he has searched for the perfect contender, and now he has found two: a brother and a sister. Walter and Hope. Either will do.

Last night something stepped from little Walter’s closet and he never woke up. Now he travels the dark road between worlds, no longer entirely boy nor wholly beast, but with one goal in mind: to prevent his sister from suffering the same fate as he. Only the creature he has become can save Hope. But is it too late to save himself?