Hideo Nakata's big-screen adaptation of Enda Walsh's stage play thriller. Four teenagers - Jim (Matthew Beard), Eva (Imogen Poots), Emily (Hannah Murray) and Mo (Daniel Kaluuya) - meet online in a cyber chatroom dominated by the presence of the charismatic William (Aaron Johnson). As in the play, the chatroom is depicted as an actual three-dimensional space. As the dynamics deepen and intensify between the five young people, things begin to spiral dangerously out of control as they goad one another into increasingly destructive behaviour.