London's East End, 1888. When darkness falls, terror begins.

The foggy streets of London's Whitechapel district have become a nocturnal hunting ground for Jack the Ripper, and no woman is safe. Flower girl Constance Piper is not immune to dread, but she is more preoccupied with her own strange experiences of late.

Clairvoyants seem to be everywhere these days. In desperation, even Scotland Yard has turned to them to help apprehend the Ripper. Her mother has found comfort in contacting her late father in a séance. But are such powers real? And could Constance really be possessed of second sight? She longs for the wise counsel of her mentor and champion of the poor, Emily Tindall, but the kind missionary has gone missing.

Following the latest grisly discovery, Constance is contacted by a high-born lady of means who fears the victim may be her missing sister. She implores Constance to use her clairvoyance to help solve the crime, which the press is calling "the Whitechapel Mystery", attributing the murder to the Ripper.

As Constance becomes embroiled in intrigue far more sinister than she could have imagined, assistance comes in a startling manner that profoundly challenges her assumptions about the nature of reality. She'll need all the help she can get - because there may be more than one depraved killer out there.