He buried his victim alive. And now he's escaped from prison and is on the run in the city.

Fiona Henderson, the daughter of the victim who'd descended into a world of silence following her mother's murder, has gone missing. Her sister Annabelle scours the city in a desperate attempt to find her. And then the body of a homeless person is found among the rubbish in a deserted alleyway.

As DIs Wheeler and Ross investigate, more suspicious deaths occur and a pattern emerges: the victims are all homeless. And so the police are pitched against a killer who is hellbent on a mission to rid the streets of the vulnerable and dispossessed.

As Wheeler and Ross descend further into Glasgow's netherworld, their investigation reveals not only a flawed support system for the disaffected, but also a criminal class ruthlessly willing to exploit them. A city of double standards, where morality is bought and sold.

But it's when the killer begins stalking DI Wheeler, that she and Ross realise that the threat is now personal.