"..Robertson teases his readers with a sense of electric tension and danger."
A young man entered the culverted remains of an ancient Glasgow stream, looking for thrills. Deep below the city, it is decaying and claustrophobic and gets more so with every step. As the ceiling lowers to no more than a couple of feet above the ground, the man finds his path blocked by another person. Someone with their throat cut.
As DI Rachel Narey leads the official investigation, photographer Tony Winter follows a lead of his own, through the shadowy world of urbexers, people who pursue a dangerous and illegal hobby, a world that Winter knows more than he lets on. And it soon becomes clear that this murderer has killed before, and has no qualms about doing so again.