Set in 1965 New York City, the story follows Terry Gionoffrio, a young, ambitious dancer striving for Broadway stardom. After sustaining a devastating ankle injury during a disastrous rehearsal, Terry’s career hangs by a thread. Desperate, broke, and facing eviction, she is taken in by Roman and Minnie Castevet, an eccentric, wealthy, and overly attentive elderly couple who live in the prestigious Bramford building. They offer her a spare room in Apartment 7A, seemingly rescuing her from destitution.Grateful for their kindness, Terry quickly grows fond of the Castevets, especially when Roman introduces her to a powerful
Broadway producer named Alan Marchant. Marchant offers Terry a coveted lead dancing role, reigniting her dreams. However, Terry’s gratitude soon curdles into unease. She begins experiencing terrifying, vivid hallucinations, sleep paralysis, and sudden, agonizing physical pains. Her body seems to be undergoing strange physiological changes, yet the Castevets dismiss her concerns, plying her with bizarre daily vitamin cocktails and insisting she rest.Terry’s friend and fellow
struggling artist, Leo, grows increasingly suspicious of the Castevets and the Bramford’s dark, oppressive atmosphere. He urges Terry to flee the building, warning her that something deeply sinister is occurring. As Terry digs deeper, she uncovers the Bramford’s horrific history of occult practices and unexplained tragedies. She realizes that the Castevets are not benevolent benefactors, but rather the leaders of a secretive satanic cult.The horrifying truth dawns on Terry: she has not been chosen for her dancing talent, but rather to act as a human vessel to incubate the spawn of Satan. The "vitamins" she has been consuming are actually drugs designed to control her, and her injury was manipulated to make her utterly dependent on them. Trapped within the sprawling, labyrinthine apartment and closely watched by her cult-member neighbors, Terry’s attempts to escape are repeatedly thwarted.Cornered, stripped of her autonomy, and facing a demonic pregnancy against her will, Terry suffers a profound psychological breakdown. In a desperate final bid to reclaim control over her own body and soul rather than yield to the cult's dark prophecy, Terry makes the ultimate, tragic sacrifice. She plunges to her death from the building's window, ending her nightmare. Her tragic demise unknowingly paves the way for a young pregnant woman named Rosemary to move into the building shortly thereafter, leaving the Bramford's dark legacy to continue its insidious work unabated.