What if the legends are real? Who knows what secrets lie beneath our city streets? Who knows what childhood fears are as real as the shadows that creep across the cellar floor? Katherine Sinclair knows... Because the baby she now holds in her arms is not human at all, but a changeling... And her own precious child has been ... troll-taken.

Desperately searching for their stolen babies in the long-forgotten world beneath the streets of Chicago, Katherine Sinclair and her mysterious, nonhuman companion, Crystal, are drawn into the war between the Under Dwellers and the human race. Original.