In Rehobeth, Alabama, 1988, two little girls trick an overweight child they have nicknamed “Loverboy” into dropping his pants and preparing for a kiss, only to tease and humiliate him. When one of the girls rides home alone afterwards, Loverboy knocks her from her bicycle and remorselessly throws her off a bridge, making the girl’s death look like an accident.
In the present day, struggling to pay her way through school following the death of her father, college coed Kylie Atkins is recruited by entrepreneur Gary Preston to join his online pornography venture Girl House. Girl House allows its users to watch the ladies living inside the house 24/7 via 50 camera feeds. The girls perform stripteases and regular daily activities with the option of performing sexual acts on camera for additional money. Gary assures Kylie that Girl House’s technology cannot be hacked and that the house’s secret location is untraceable. Gary brings Kylie to the house and introduces her to Steve, who shares security guard duties with Big Mike. Kylie also meets fellow Girl House residents Kat, Devon, Janet, Heather, and Mia.
Kylie performs her first striptease online and captures the attention of Loverboy, who watches from his basement in Atlanta and is known as a Girl House regular. Also watching are Alex and his college roommate Ben Stanley, who recognizes Kylie as the girl he has had a crush on since kindergarten. Having been banned for her heroin addiction, former Girl House performer Anna sneaks back into the house and convinces Gary to give her another try. Ben and Kylie begin a relationship.
Kylie has a private chat session with Loverboy. Loverboy hacks into the computer system and surprises Kylie by sending her a picture of his face. Anna later finds the picture while snooping on Kylie’s laptop. Later, Ben admits to Kylie that he knows about her involvement with Girl House. However, they talk through the issue and continue their relationship.
Loverboy angers the other women in Girl House by continually asking for Kylie when she is not there. The girls begin making fun of him for being pathetic. Loverboy notices his picture on the bulletin board inside Girl House with a handwritten caption that reads, “what a stud.” Kylie comes home and takes down the picture as soon as she sees it. Eventually, Loverboy snaps. He hacks into Girl House’s system, dons a mask, and breaks into the building housing Girl House’s servers where he kills the website’s technical team. Loverboy straps Gary to a chair and stabs him several times. Slowly dying from blood loss, Gary is forced to watch through the monitors as Loverboy travels to the house’s location and continues his rampage. Loverboy kills Steve at the security gatehouse. He then strangles Anna with a piece of rope inside the house’s Off-Camera Room.
From his dorm room, Alex watches as Loverboy mutilates Devon during a private dance. Alex shows Ben the carnage taking place live at Girl House. Ben tries texting a warning to Kylie, but she returns to Girl House just as Loverboy jams incoming and outgoing communications. Oblivious to what is going on inside the house, Kylie retires to her room. Ben instructs Alex to try hacking into Girl House to find its address while he goes in search of other ways to locate Kylie. Meanwhile, Loverboy kills Heather and her boyfriend while they have sex. Janet investigates the commotion and Loverboy throws her over an upstairs railing after she catches him in the act of severing the boyfriend’s head. Janet survives, but has her legs broken from the fall. Then, he locks Mia in the sauna room. Mia smashes a lump of coal through the door and escapes to the pool outside where Loverboy kills her with a sledgehammer. Gary eventually dies from blood loss while watching the horror unfold onscreen at the technical facility. Kylie realizes the danger when she spots Loverboy at the pool from her window. Loverboy electronically locks Kylie inside the house. Janet attacks him, but is unsuccessful and gets stabbed in the head.