Eva is skyping her best friend Naomi, when the latter suddenly disappears from the screen and a menacing figure appears in the background - who then proceeds to attack. Horrified, Eva calls an ambulance and flees Hampton, fearing for her own safety. DCI Helen Lavery leads the investigation into the murder, though there are no leads, no further witnesses, and no sign of forced entry. Slowly, the pieces of the puzzle start to come together; but as Helen inches toward solving the case, her past becomes caught up in her present. Someone is after both her and Eva. Someone who will stop at nothing to get what they want. And as the net starts to close around them, can Helen escape her own demons as well as helping Eva to escape hers?