THERE IS A SECRET WAR GROWING BENEATH THE STREETS OF LONDON. The immense Sixty-One Nails follows Niall Petersen, from a suspected heart attack on the London Underground, into the hidden world of the Feyre, an uncanny place of legend that lurks just beyond the surface of everyday life. The ancient peoples are at war - but is Niall really the one who can wield the dark magic of the Untainted, and save them all?