Maisie Williams (Arya Stark) gives an outstanding, critically acclaimed performance as Casey Jacobs, a troubled teenager battling against a malicious and terrifying cyber stalker. When Casey discovers her laptop has been hacked she assumes one of her school friends is to blame. In fact, the teenager has fallen prey to a sophisticated hacker who now has access to her anonymous posts and private selfies. Most disturbing of all, the perpetrator has taken control of Casey's webcam, and is watching her every move! But why has the Cyberbully chosen her, and is Casey Jacobs as innocent as she seems?