A Man of Shadows

A private eye stalks a serial killer through a world divided into zones of perpetual Day, Night, and Dusk in this "disturbing and bizarre" sci-fi thriller from "one of the great masters of weird fiction" (Adrian Tchaikovsky, award-winning author of Children of Time). In a city divided into zones of perpetual Day, Night and Dusk, a lowly private eye attempts to save a teenage girl from the evil forces that seek to destroy her.
Below the neon skies of Dayzone-where the lights never go out, and night has been banished-lowly private eye John Nyquist takes on a teenage runaway case. His quest takes him from Dayzone into the permanent dark of Nocturna. As the vicious, seemingly invisible serial killer known only as Quicksilver haunts the streets, Nyquist starts to suspect that the runaway girl holds within her the key to the city's fate.
In the end, there's only one place left to search: the shadow-choked zone known as Dusk.