London, 1929 – It isn't easy being a fashionable flapper and emulating your silver screen heroines when you live in a poky East End terrace with your poor, widowed mother, your over-achieving sister, and such disreputable and drunken lodgers as you can find to help pay the bills, as sixteen-year-old Lucy "Lucille" Kitson can testify. However, their newest lodger – a young writer from the jazzy metropolis of New York – is far more to her liking, and his only shortcoming is that he is concealing a secret that makes him a marked man, and endangers all who befriend him.
Pulled inexorably into a dark supernatural world, and into an even darker scientific one, Lucy Kitson finds her priorities and her life challenged equally. She must endure hard lessons if she is to help put an end to the "Healers", their murderous nocturnal predations, and their sinister designs that threaten the lives and souls of thousands.