The fourth Onyx Court novel, a critically acclaimed fantasy series from the author of A Natural History of Dragons, and a Kirkus Reviews Best of Science Fiction & Fantasy title

1884: Eliza searches for her childhood sweetheart, snatched from the streets of Whitechapel. No one believed her when she said that he was stolen by the fairies. Beneath London, the fae in the Onyx Court are under siege, the iron of the underground railway destroying their home. Many flee, but those who stay have one goal: to find safety in a city that does not welcome them.

But what price will the mortals of London pay for that safety?

 "An absorbing finale to a series that has grown richer with every installment." Kirkus (starred review)