Joe watches police body-cam footage from Kate’s death. An officer arrives at Kate’s house as gunshots sound from within. Kate stumbles out of her house looking disheveled, pale, and as if she has aged 20 years in the last week. She yells into the house for someone to get out and to leave her alone. Joe is shocked to see her holding a black handgun, knowing she hated guns. Kate seems oblivious to the officer, her eyes darting in fear as she says, “she’s everywhere” (166).

The officer attempts to de-escalate. Kate grows calm and repeats that it is only in her head. With grim determination, she raises the gun to her temple and pulls the trigger despite the officer’s attempt to stop her. Joe has a violent physical reaction. His nausea is replaced first by deep sadness, then by detached resolve. He opens more of Kate’s files.

Riley recalls lying to the police about why she’d brandished a knife in the park, convincing them she was okay to be driven home. The woman was in the police car with her, talking about goats and phone numbers. Back home, Riley tried to film the woman, but she didn’t show up on the video. Riley contemplated death by suicide as a way to escape the woman, which prompted her to call her father. Riley notes that she feels a physical pressure in her brain when the woman is near and that her perception of time has become erratic and unpredictable.

Now, Riley is talking with Hannah, explaining that when she began ignoring the woman’s screams, the woman started showing her things. She has a vision of her mother, Kate, beside Hannah. Kate’s image becomes grotesque: her smile distorts, her eyes fill with blood, her temple wound reappears, and she laughs while blood drains. Riley shuts her eyes. Hannah comforts her, attributing her emotions to grief.

When Riley opens her eyes, Kate is gone, replaced by the corpse of a small purple baby. The wrist tag reads the name “Ashley Chao.” Riley asks Hannah if she lost a baby. Hannah confirms her infant daughter Ashley died about 10 years prior. Riley then has a vivid hallucination of her father and Hannah having sex on the dining table. When the vision ends, Riley asks about an affair. Hannah admits it happened after Ashley’s death.

Riley sees the woman standing on the table and hears the woman’s voice in her head, explaining how she knows these things. The woman got into her father’s head and studied him, Riley relays, then Hannah, learning their weaknesses, before moving into Kate’s mind—and now it is in hers.

Joe continues reviewing Kate’s files. Her hallucinations began three days before her death and caused extreme distress. An email reveals that her friend, Fran, loaned Kate the gun. On her last night, Kate researched schizophrenia, demons, and the occult. A doctor’s report shows Kate described a hallucination matching Riley’s description: a woman with a pale face, long black hair, and a hospital gown.

Joe switches to his live security camera feed. The image of the dining room is obscured by swirling dark red. He hears Riley explaining that the woman is on the table, watching the hidden camera. Joe realizes the red image is the woman’s bloody eye socket pressed against the lens. The eye moves, revealing the full bloody face of Bishop—with long black hair—smiling and waving directly at him.

Joe rushes to the dining room but finds only Riley and a terrified Hannah. Joe takes Hannah outside to talk privately. Hannah concludes that one of the project’s subjects, an Antenna, is inside Riley’s head. Joe confirms it is Bishop. Hannah is shocked, stating Antennas are only supposed to observe, but Joe confirms Bishop can now implant visions. They realize she has watched them for about 10 years,  growing stronger, and is now holding Riley’s mind hostage. Joe stops Hannah from reporting this to headquarters, fearing the Company will lock Riley up and incorporate her into further experimentation. He tells Hannah he will handle it.

Back inside, Joe finds Riley exhausted and detached. She reveals the woman claims to be Joe’s prisoner and intends to make Riley die by suicide unless he sets her free. Joe tells Riley the truth about Antenna-201, a.k.a. Bishop, who arrived about 10 or 11 years ago, despite Antennas typically only surviving around two years.

Joe explains the Antenna program. Subjects are kept in chambers filled with nerve gas that induces total sensory deprivation. He recounts a story from a contractor named Matt about the program’s origin during the 1970s: A CIA prisoner in long-term sensory deprivation was given an experimental drug and developed the ability to tap into his former boss’s senses. This accidental discovery of mental intercepts was developed over decades into the current program. He admits he does not know who he truly works for or where the Antennas come from.

Riley says Bishop told her the process hurts. Joe explains that to access their abilities, they must be tuned by removing the gas, causing an agonizing flood of sensory input. He insists Bishop didn’t force Kate to kill herself, only pushed her, and that Riley is stronger because she understands what is happening. Joe promises to take care of the situation the next day.

Joe wakes on the recliner after a restless night. He finds Riley awake, staring blankly at the muted TV. Riley recounts the night’s escalating hallucinations from Bishop. She describes a vision of Joe trying to force her to overdose on sleeping pills, which she only knew was false when she found the real Joe asleep. She then describes a spider burrowing into her hand and crawling under the skin to her wrist and resisting the urge to cut it out with a knife. She describes a vision of the house on fire where she watched Joe burn to death.

Joe is horrified and asks why she did not wake him. She asks what he could have done. Joe hugs her and promises to end it by setting Bishop free, speaking aloud so Bishop can hear. He tells Riley not to move from the couch while he is gone. Riley remains unresponsive. Joe leaves for work, intending to confront Bishop at the Facility.

Joe arrives at the Facility, acting normally. He instructs security chief Tyler to station all guards in the lobby, pulling them away from the lower levels. In the break room, Joe orders his Control Operators, Chuck and Tariq, to initiate a full system reset immediately. Chuck protests that they are still monitoring Bishop, but Joe overrules him. Hannah arrives, but Joe says nothing to her other than a polite greeting.

In his office, Joe waits, knowing Bishop is likely watching through his eyes. Tyler calls to question leaving Level Two unguarded during a shutdown, but Joe insists it is an order. An intercom announcement declares a full system reset. Only a few people know the reset will disable the Facility’s security cameras. Joe retrieves a spare oxygen tank and mask from a file cabinet. As the system shuts down, Joe steps out into the now-unmonitored hallway.

Joe hurries to Level Two and straps on his oxygen mask. He enters Bishop’s chamber, where she is twitching on the floor, her eyes wrapped in gauze and bandages. He tells her he will set her free and removes the protective mitts from her hands. He leaves and enters an adjacent utility corridor, deliberately averting his eyes so Bishop cannot see his destination. He locates the gas regulator for Bishop’s chamber and punctures the rubber hose, causing a major gas leak.

He watches through Bishop’s window. The change in gas levels causes Bishop’s senses to flood back, throwing her into agonizing pain. She screams and claws at her body, trying to dig out the source of the pain. She tears the bandages from her empty eye sockets. In a frenzy, she bashes her head against the glass and tears chunks of flesh from her chest. Joe watches her self-destruct and says goodbye.

In the control room, the system reboot finishes. An alarm sounds. The cameras reveal Bishop tearing herself apart. Chuck frantically calls Joe, who calmly pretends to be unaware and deliberately delays. He then orders Tyler to send a suited-up team to Bishop’s cell. When Tyler and his guards arrive at Bishop’s cell, they are shocked by the horrific scene.