Six months on from her last brush with the paranormal, police officer Annie Graham, now Annie Ashworth, dreams of settling down and starting a family. But now that serial killer Henry Smith has escaped, she knows that trouble is coming. She thwarted him once, and he’s out for revenge.

When a local man vanishes in mysterious circumstances, Annie realises there may be darker forces at work. And when she takes a glimpse of a monster with a thirst for blood, her worst fears are confirmed. With a serial killer on the loose and an unknown horror stalking the sewers, Annie is in a race against time to stop them before they kill again.

But will she be able to save herself from their clutches?