Room 203 (2022)

Kim is a young woman about to start college and has decided to move into a newly rented apartment with her best friend, Izzy. Kim’s parents, however, are not at all supportive of this idea, owing to Izzy’s reputation as a troubled young woman whose mother died due to a drug overdose. They warn Kim they will cut off contact with her if she moves in with Izzy. Adamant to support her friend, Kim ignores them and meets Izzy inside the apartment. Soon after, they encounter Ronan, the landlord of the building who gives them a tour and warns them about two crucial tenant rules: do not damage the elaborate stained-glass window in their apartment, and stay out of the basement. Kim and Izzy are mesmerized by the window, which depicts medieval knights killing each other; it's both fascinating and unsettling to them. Kim also sees a small but noticeable hole on the wall of her room and tries to cover it up by hanging a mirror over it, this does not work, as the mirror repeatedly keeps tilting or falls to the ground. Izzy finds an amulet necklace in the hole and begins wearing it, despite Kim finding it creepy that her friend would wear discarded jewellery. That night, Izzy begins sleepwalking; it's revealed she had sleep issues previously, but nothing quite like this that Kim can remember. After a restless night, Kim wakes up late for her college orientation and rushes to the campus.

Kim arrives too late for her orientation, but a friendly student, Ian, gives her a private tour. They bond over their shared passion for journalism, both of which they hope to pursue after college. Kim decides to write a paper in her course on Izzy's fraught family life, but doesn't ask permission from her before doing so. Izzy, meanwhile, begins to act out in increasingly disturbing ways. Although Izzy has always been a free spirit open to partying, Kim is shocked to see her bring first a young man, and then a young woman, back with her to the apartment to spend the night; both then disappear before the morning. Several nights later, Kim is woken up by a fluttering noise and is startled to find a crow in her room. To her dismay, she sees the bird slither into the hole in her wall, which has now grown and somewhat resembles a decomposing wound. Earlier that day, Kim found a metal music box with the names of a couple written inside it; now, just as the crow disappears, Izzy comes to Kim's room and begins banging on the locked door. When Kim opens the door, Izzy is holding the music box, and blood is spilling down from her head; she had been slamming her head against the door to 'knock.' Kim takes care of her and keeps her company that night, and Izzy seems to be normal again the next day. But her sleepwalking episodes continue and grow worse when she wanders down into the basement. Kim recovers her terrified friend and brings her back to the room. Izzy continues to decline, and Kim worries she is losing her friend to mental and emotional distress.

Kim had often seen the landlord, Ronan, watching them and behaving strangely. One day, she finds him in their apartment, staring at the stained-glass window. When he becomes aware of her presence, he reprimands Kim harshly for having gone down to the basement. Kim shares all this with Ian, as well as her concern for Izzy's current state. Ian suggests that she investigates the history of the building. Together, they read up on the internet about a bank manager named Liam McNally who, with his wife Karen, previously lived in the same apartment: Room 203. Decades earlier, shortly after Karen became pregnant, Liam murdered her before killing himself in the apartment. Kim and Ian realize that the names Liam and Karen are the same names inscribed inside the music box that Izzy carried around during her sleepwalking. Kim then identifies the eyewitness who discovered Liam and Karen's bodies: a janitor named Milton Briggs. Meeting with Milton, he reveals that despite Karen's death, the baby she was carrying survived. Ian does his own research into the images present on the stained-glass mural in the apartment, and he connects them to Celtic pagan symbols and finally to the Irish mythology figure Morrigu, who often appears in the form of a crow and symbolises death.

Meanwhile, Izzy stumbles across Kim’s college paper about her. She angrily confronts Kim before storming out. Kim rips open the hole on the wall, and a shriveled, desiccated hand from a dead body falls out of it. Kim recognizes the hand is wearing a distinctive ring: the same ring that the female lover Izzy brought back to the apartment weeks earlier was wearing. Before Kim can react, Ronan storms into the apartment and abducts Kim, revealing that he is the baby that survived, and the amulet Izzy wore belonged to his mother. Ronan is now subject to the curse of the Morrigu, which chooses its victim through the necklace with the cursed amulet. Once a victim is cursed, the Morrigu compels the person to kill both others and themself, but while Izzy has succumbed and killed others (the young man and woman who she brought back to the apartment), Izzy's survival instinct is strong, and she has resisted killing herself, this is likely due to her resilience from her troubled past. Ronan has decided to take matters into his own hands out of fear that Morrigu will come after him if she does not continue to receive her offerings.

Ian rushes to the apartment, where he is killed by a possessed Izzy. Kim manages to escape Ronan before finding Ian's body and following Izzy into the basement. Ronan follows in pursuit. Ronan manages to catch up to her, but before he can kill Kim he is possessed and turns the gun on himself, committing unwilling suicide. Izzy, fighting the Morrigu's possession, experiences rapid personality shifts between her real self, who asks for Kim’s help, and her possessed self, who grins and laughs while trying to goad Kim into killing her. Kim refuses, and Izzy attacks, stabbing her. Just as she is about to kill her, Kim rips off the cursed amulet from Izzy’s neck. The curse lifts, and Izzy, realizing what has nearly happened, breaks down in Kim's arms. The two friends walk up to their apartment with the intention of destroying the stained-glass window, but are spooked when hundreds of crows seem to swarm outside the window. With a scream, Kim finally gathers up the courage to shatter the window. The two escape the apartment, and Izzy rushes Kim to the hospital, hopefully before she will bleed to death. As Kim and Izzy exit the building, behind them, in Room 203, the figure of the Morrigu appears amid the shattered stained-glass.