The last of the survivors in Rainbow Falls, Montana, band together to brave the onslaught of the creatures set loose upon the world, discovering the full scope of Victor Frankenstein's nihilistic plan to remake the future.

Louisa and her friends establish a posh residence in London, where the escalating activities of religious zealots and her father's increasingly powerful evil spirit force her to choose sides in an imminent war between old gods.

As seventeen-year-old Louisa struggles to control her new changeling powers while settling into her role as a maid at Coldthistle House, Mr. Morningside plans a fete for human guests, Upworlders, and a man claiming to be Louisa's father.