One year before the film's events, high school student Laura Barns (Heather Sossaman) committed suicide due to ridicule received over an embarrassing video of her passed out at a party. Six of her classmates, Blaire Lily (Shelley Hennig), Jess Felton (Renee Olstead), Val Rommel (Courtney Halverson), Ken Smith (Jacob Wysocki), Adam Sewell (Will Peltz) and Mitch Roussel (Moses Jacob Storm), were especially horrible in their treatment of her, as they were unpopular and Laura was the most popular girl in school.

A year later, the six classmates decide to get together to talk with one another via Skype, but are ill-prepared when an uninvited seventh person logs onto Laura's old Skype account and shows that he or she knows quite a bit about the prior year's events. The unknown person threatens the group and states that if they log out or stop talking, someone will die. The person torments the friends, by attacking them in their houses. As the chat progresses, the truth about who posted the video begins to emerge and other secrets are revealed that test their friendships.