It's an average school night as Blaire and her boyfriend, Mitch, start a somewhat intimate video chat. Suddenly, they're interrupted by their friends, Jess, Adam, Ken and Val, who are ready to launch into a group chat session. Before long, the group is joined by a user known only as "Billie227." They think it's just a glitch and go about their conversation, until Billie begins typing. What comes next devolves into their worst nightmare. As Blaire begins receiving messages on Facebook and e-mails from someone or something claiming to be Laura Barns - the girl who killed herself exactly one year ago - she frantically tries to figure out who has intruded into their group chat. Meanwhile, Billie's games force them to confront their deepest, darkest secrets and lies. If they find out who posted the shaming video of Laura that led to her death - even if that means these friends suffer in the process - they will appease their tormentor and survive the night.