Nocebo

While engaged in a phone call, Christine is approached by a dog that unexpectedly arrives. This seemingly normal interaction takes a dark turn as the dog spreads ticks onto her, vanishing moments later, setting off a chain of bizarre events.

One tick attaches itself to Christine's neck, igniting a series of baffling health issues. Her family is left perplexed as her condition worsens, leading them to seek help.

Diana appears at Christine's home, introducing herself as the caregiver Christine hired. Instantly, distrust fills the air, particularly from Felix and their daughter Bobs, as Diana's presence brings an unsettling atmosphere.

As she settles in, Diana begins to conduct dark rituals, laying out a collection of relics and folk magic ingredients. Felix and Bobs grow increasingly wary as Diana creates a mysterious altar in the fireplace, hinting at her uncanny powers.

During dinner, Christine suffers from an intense pain in her arms, prompting Diana to intervene in a strange manner. By hovering her hands over Christine, she alleviates the pain, revealing her supernatural abilities that originate from a past encounter.

Suspicions mount as Felix confronts Diana about her methods and orders her to stay away from Christine. In a chilling warning, Diana ominously tells Felix to 'be careful with the stairs,' foreshadowing the misfortunes to come.

After the confrontation with Diana, Felix is unexpectedly attacked by Bobs' pet canary. The ensuing chaos results in a panic-induced accident that leaves the canary dead, deepening the rift in the family.

In a somber moment, Christine and Diana bond over the canary's funeral. Tensions escalate as Felix's jealousy and fear of Diana grow, creating a palpable divide in the household.

Felix investigates and discovers Diana's altar, leading to her swift expulsion from the home. Before leaving, Diana asks Bobs for a favor, planting seeds of conflict and distrust within the family.

The next day, Bobs reveals Felix’s scheme to frame Diana, igniting a fierce argument between Christine and Felix. As tension crescendos, Felix suffers another attack by a bird resembling Bobs' canary, leaving him injured.

In a chilling twist, Diana performs a final ritual, revealing her true intentions are not to cure Christine but to exact vengeance for past grievances. Christine is tormented by vivid flashbacks of Diana's tragic life.

Christine learns that her clothing business indirectly led to the tragic death of Diana’s daughter, entangling their fates in a web of guilt and regret. As Christine pleads for forgiveness, Diana cruelly reminds her of the pain she caused.

The horror of the reunion escalates as Felix finds Christine's charred body, slumped over her sewing machine, signifying the culmination of Diana’s retribution. The family is forever altered by this devastating loss.

In an act of tragic finality, Diana jumps from the roof, sealing her own fate. As a black chick emerges from her mouth and enters Bobs', it signifies a sinister new beginning for the child.

The film concludes with Bobs alone in the wilderness, embarking on a new journey of foraging for herbs. The spirit of Diana watches over her, suggesting their fates remain intertwined in an eerie connection.