Elizabeth calls for help from the officer guarding her, but she finds him murdered as well.
She is attacked by a hooded figure hidden in her closet, but she stabs him repeatedly and flees, only to be apprehended by another hooded attacker outside.
Though Elizabeth notifies the police and calls Lynn to warn her, the message is garbled.
The attackers bind Lynn and prepares to cut open her stomach, but abruptly leave, hiding the camera as they do so.
The graduate board reluctantly gives her a grant, with the help of Sally, one of her friends on the graduate board pushing for her approval.
She spends the next few months continuously chatting with strangers, much to the chagrin of her boyfriend, Damien, and friends Jenni and Max.
Afterwards, another hooded man enters the room with Elizabeth, preparing to kill her, but she overpowers him and strangles him with her chain.
She manages to escape to aboveground, bludgeoning other attackers before hijacking one of their cars, but crashes when blindsided by another member's car; she is removed from the wreck by the killers and dragged back to the complex.
The movie begins with Elizabeth logging into a webcam-based social media site known as The Den, which allows users to chat with random strangers across the world, similar to Chatroulette.
For her graduate project in sociology, she proposes to chat with as many strangers as possible and calculate how many meaningful conversations she can accumulate.
Later, Elizabeth is prompted to chat with the stranger again; the stranger reveals that they witnessed Elizabeth having sex, and later their webcam turns on and reveals the account holder bound and gagged before being murdered by a masked man.
Elizabeth is shaken and immediately takes the video of the murder to the police, who acknowledge that it appears genuine but advise her that such snuff films are usually faked, and there is little they can do about it.