17-year-old Maria Brennan is a timid outcast high schooler
bullied by her classmate, Mark. Her only friend is Lily, whose boyfriend Sean is her secret crush. Maria's distant father Dan is a
philandering plastic surgeon and an obsessive
perfectionist, while her mother Amy has
depression and constant nightmares. Maria accidentally discovers a
sonogram of
twins. Whilst pleasuring herself in the bathroom one day, her reflection begins to move on its own, terrifying her. She attempts to talk to her parents the following morning, only to be ignored. After dreaming of her own birth, Maria sees her reflection talking to her, calling herself "Airam." Airam is charismatic, assertive, and confident. She tells Maria she can take her sadness away. Dan offers Maria an early birthday present; she arrives at his office only to realize the "gift" is cosmetic surgery to fix her "flaws." Crushed, she confides in Airam. Amy senses that something is wrong with Maria, but is repeatedly shut down by Dan. Lily takes Maria for a
skating lesson for the upcoming
prom. However, after Maria slips and is unable to get back up, Lily simply taunts her and abandons her. Finally, she is humiliated and
physically assaulted by Mark at the dance. Devastated by these events, Maria goes into the bathroom to find Airam. Their palms and lips touch, allowing them to switch places. Later, Amy has a nightmare about giving birth. At school, Airam is visibly more confident and assertive. She reveals to everyone that Mark has been bullying her because he has a crush on her, embarrassing him. She arranges for Amy to run into her husband's
mistress as a way of forcing her to acknowledge Dan's
affairs and their superficial marriage. Maria, stuck in the mirror, is appalled by Airam's behavior. Airam insists she is only being honest, and tells Maria that all of the people around her must answer for their sins. Airam lures Mark to the shower, breaks his knee and
bludgeons him repeatedly. After secretly practicing figure skating alone, Airam has another lesson with Lily, who becomes intimidated by the way Airam is acting. When Airam chases Lily across the ice, Lily falls into the pavement, fatally crushing her skull. In the bathroom that evening, Maria begs to switch places, but Airam reiterates that Maria wanted Lily out of their lives. Maria asks again who she is, but Airam only replies, "You know me." Airam then seduces Sean, and the two begin an intense relationship. Airam begins living more wildly, smoking
marijuana, skipping school, and drinking alcohol. While at a motel together, Sean gets a phone call telling him the police want to speak to him and Maria. Airam refuses to go, and Sean becomes suspicious. He picks up his jacket to leave, and in a moment of impulse and fear, Airam hits him over the head with a vodka bottle, killing him. Deeply upset, she sits against the mirror in the bathroom and she and Maria cry together. Amy has another dream about giving birth. It is revealed that Maria originally had a twin sister, who was
murdered after birth by Dan due to her supposed
physical deformities, against Amy's pleas. Airam leaves the motel and confronts Dan at the clinic after hours, pretending to be heavily
intoxicated. She strips naked and demands to know if he would still love her if she were deformed. Clearly perturbed by the question, Dan finally answers, "Yes," and she slits his throat with a
scalpel. As he lies dying, she cries and asks him, "Why couldn't you love me?" Airam no longer sees Maria when she looks into the mirror. Frightened and alone, Airam returns home and crawls onto the bed next to her mother. A series of mirrored
burst shots depicts Maria and Airam both lying by either side of Amy on the bed, implying that they have merged into one. ==Cast==