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During a July 2020 COVID-19 lockdown in London, friends Haley, Jemma, Radina, Emma, Caroline, and Teddy join the weekly Zoom call they have been using to stay in touch. Haley has arranged for them to partake in a virtual séance led by the medium Seylan, who emphasizes that they should not disrespect the spirits, though only Haley and Caroline takes it seriously. Teddy is forced to leave the call when his girlfriend Jinny disconnects him. Jemma claims to feel intense tension around her neck and begins to cry, explaining that she feels the presence of a school friend who killed himself by hanging. Seylan's internet cuts out and disconnects her from the call, prompting a laughing Jemma to admit that she made the story up because she was bored, which angers Haley. While they are arguing, Haley's chair is suddenly pulled across the room, to the shock of the group. A series of terrifying phenomena commence: the legs of a hanging corpse appear in Caroline's attic when she goes to investigate a noise; when Haley points her instant camera down the hallway to take a photo of her living room, it shows a similar figure hanging from the ceiling; and Emma's wine glass shatters untouched. As the girls panic, Haley gets back in touch with Seylan and explains the situation. Seylan explains that Jemma's prank, fabricating a deceased person, may have led a demon to take on the guise of the deceased person and the identity like a mask, allowing the demon to pass into the living's world. She instructs them to close the séance, but the demon interrupts her and she is disconnected again. The girls attempt to close the circle following her instructions. Relieved that the ordeal seems to be over, the group members begin preparing to leaving the call, when Caroline suddenly appears to be flung into the camera. Emma, forgetting to switch off a filter, turns her camera towards her living room, where the filter places a mask on the face of an invisible figure which then turns to look at her. She scatters flour on the floor, in which footprints approaching her appear, and she is attacked before escaping into her bedroom. Alan's body drops down behind Radina, prompting her to flee, but the demon kills her. Caroline's camera turns back on to show the demon smashing her head into her keyboard while she pleads for help before cutting out. Haley is pulled backward through the door of her room. Jemma, who lives around the corner from Haley, rushes over. Teddy returns to the call to see that only Emma remains. Unaware of everything that has occurred, Teddy believes Emma is playing a prank on him, but he is attacked by the demon after it takes the form of a horrifying humanoid figure. He is chased into his garden, where he Jinny is lifted into the air and has her neck snapped. He runs away and hides, using a lighter to see where he is going, but the demon distracts him with an eerie music box his brother used to scare him with as a child. The demon knocks him down and he drops the lighter, causing a fire that burns him to death. Emma's bedroom door opens, and she throws a blanket which drapes itself over an invisible human shape. She opens her window to escape, and falls to her death. Jemma breaks into Haley's home, and the demon smashes a bottle against her head and starts to destroy the kitchen, but Jemma recovers and finds Haley hiding under her desk. They attempt to escape the house using the flash from Haley's camera to light the way. The demon appears in the final flash of light, and rushes at them as the Zoom call timer expires.