ABOVE Victorian London is 'the monster city" -- a place of industry and progress, poverty and disease, with veins of iron threading through its flesh. BELOW The Onyx Court is dying -- its queen missing, its criminals unchecked, and the very fabric of the Onyx Hall itself torn apart by the iron of the Underground Railroad. BETWEEN No one believed Eliza O'Malley that her childhood sweetheart was stolen from the streets of Whitechapel by the faeries. Her search for him will take her to the heart of the crumbling, corrupted faerie court -- and to a final, desperate chance that might save them all. But first she must confront the faerie who betrayed her seven years ago . . .