Plot
The film begins with Wendy Mallet recounting her tragedy when her son, Jackson Mallet, broke into the abandoned Abaddon Hotel and never came out more than a year ago. A video is shown in which Jackson runs frantically around the hotel begging for help before having a mental breakdown. A cult follower is seen slowly approaching him.
On October 6, 2017, Suzy McCombs presents a Hell House LLC special program, with Arnold Tasselman, Mitchell Cavanaugh (Diane Graves' coworker from the first film), and Brock Davies as guests. They discuss the veracity of the Hell House documentary. Arnold points out that he tried to take down Mitchell's documentary, arguing that it is a hoax, causing damage to the town's reputation. At the same time, Mitchell reiterates that Diane and her cameraman died inside the hotel, and it is not a safe place to go. A journalism team from an online blog is watching the program. Its presenter, Jessica Fox, claims that with Mitchell's help, they can break into the Abaddon in hopes of a spike in popularity for their website.
They meet with Mitchell outside the Abaddon hotel, who says that breaking in will not be easy, as the police are patrolling around the hotel to prevent any more disappearances, such as that of a teenage livestreamer who broke into the hotel and disappeared. In another video, a couple picks up a strange woman asking to be dropped off at the hotel, only to be revealed as the ghost of a tour-goer who died in the haunted attraction in 2009.
4 days after their break-in, a distressed Jessica Fox is questioned by the Rockland County police. She cannot remember what happened and has a panic attack.
Mitchell, Jessica, Molly, and David intend to break in, joined by Brock Davies and his cameraman Malcolm, to investigate the hotel in a paranormal style. However, Molly cannot bring herself to enter and stays outside. Mitchell, Jessica, and David head for the basement, while Brock and his cameraman go into the dining room where Andrew Tully, the hotel owner, committed suicide along with several cult followers of his satanic cult. When they try to communicate with Tully via a Ouija board, they see the ghost of a woman.
Molly enters the hotel at David's request. The group discovers that Alex from the original Hell House team went to the Abaddon in April 2009, before the Hell House disaster. He is seen making a deal with an unseen man. When the group reunites with Molly and finds out that David never asked her for help, they try to leave, only to be trapped inside. They begin to experience paranormal events, including the ghost of Melissa, a Hell House actress who died in 2009, and the hanged bodies of Brock and his cameraman. They are then captured and sent to the dining room.
Back at the Morning Mysteries show, Mitchell claims that the hotel lures people inside to kill them and trap their souls there. Once the show ends, a crew member tells Suzy that Arnold Tasselman called to apologize for missing the interview. Suzy is shocked, as "Tasselman" has just left after the show.
When Mitchell wakes up at the hotel, he finds Jessica and Molly tied up, along with the ghostly figures of Mac and Alex, two of the original Hell House staff. Tully shows up, taunting Mitchell about how he lured him into the hotel despite Mitchell saying he would never enter it, revealing that "Tasselman" was Tully all along. Then, he sees Diane's ghost playing the piano. Tully tells him that, for the dominoes to keep falling, he must choose one of them to walk out of the hotel to lure more people into it. Molly gets killed, and Mitchell, having a breakdown, gets up. Jessica cries desperately for help.
At present, Jessica is at the police station. When the officer questioning her turns around, it is revealed that she died inside the Abaddon as well, as we can see her ghost staring at the camera.
