The narrative begins with an emotionally charged scene, where a young girl discovers her mother's lifeless body in a disorderly bedroom. This traumatic moment resonates throughout her life, as we leap forward to the present, where the now-adult Rose Cotter, portrayed by Sosie Bacon, works as a therapist. She wrestles with the unsettling aspects of human nature that her profession often unveils.
Her day takes a shocking twist when she meets Carl, a manic patient played by Jack Sochet, who is consumed by his own fears of death. Despite Rose's best attempts to calm him, Carl's fixation on mortality serves as a grim harbinger of the horrors that lie ahead.
The tension escalates with the arrival of Laura Weaver, portrayed by Caitlin Stasey, a deeply troubled young woman who has just witnessed a horrifying incident involving her professor's self-harm. Laura claims she is being tormented by a supernatural entity that manifests in various disturbing forms. As Rose listens, Laura's emotional turmoil peaks in a shocking eruption that leaves Rose shaken.
Seeking guidance, Rose reaches out to two detectives, including her former boyfriend Joel, played by Kyle Gallner, and confides in her boss, Dr. Morgan Desai, played by Kal Penn. As her personal life begins to unravel amidst the turmoil, a tense dinner with her sister Holly, portrayed by Gillian Zinser, and her husband Greg, adds to the mounting strain.
When Rose receives a phone call from Holly, the conversation is filled with apologies and misunderstandings, heightening her anxiety. Reality begins to blur as she catches what seems to be a glimpse of Laura in the distance, deepening her discomfort.
A chilling moment arises during Rose's second encounter with Carl, where his eerie, synchronized grin with Laura's culminates in him ominously declaring, > "You're going to die!" The situation escalates further when orderlies swiftly intervene, signaling that darker forces are lurking just out of sight.
In the midst of preparing for a gift for her friend Jackson, Rose is once again confronted by the unsettling image of Laura, that unnerving smile etched on her face. Upon returning home, a startling discovery triggers her security alarm, the wailing sound echoing her precarious state of mind. When the security company calls back, the voice on the other end is frighteningly inhuman, exacerbating her distress.
The weekend’s birthday celebration for Jackson spirals into chaos when he discovers the horrific surprise hidden in Rose's intended gift, leading to widespread hysteria. Despite her desperate declarations of innocence, chaos reigns, drowning her words in confusion and fear.
After this calamity, Dr. Morgan visits Rose, perceiving her profound distress and encouraging her to step back and reassess her psyche. However, her conversation with Trevor, who drives her home, leads only to doubt about her mental state, leaving her feeling isolated.
In a quest to understand the turmoil in her life, Rose turns to her previous therapist, Dr. Madeline Northcott, for guidance in overcoming the trauma from her mother's suicide. Their sessions offer some comfort, but they also surface Rose's escalating fears.
Resourceful yet haunted, Rose digs into audio recordings from her session with Laura, uncovering faint breathing sounds lurking in the background. Her research leads her to Laura's professor, Gabriel Munoz, and his widow, Victoria, who reveals that even he foresaw visions of a malevolent entity shortly after witnessing the traumatic death of Anna Powell.
As Rose dives deeper into the chilling mystery, she clashes with Victoria, who blames her for trivializing the loss their family endured. Joel reluctantly steps in to assist Rose, and together they start piecing together the horror of Anna Powell's demise, shrouded in gruesome details, further entwining Rose in the dark narrative.
The discovery of security footage from a gas station reinforces her fears, depicting a figure frighteningly similar to the smiling specter tormenting Rose. This visual evidence compels her to accept the possibility that her experiences of dread are not isolated, as walls of reality and madness begin to collapse around her.
Upon returning home, an unexpected event confronts Rose: Trevor arranges for Madeline to check on her, interpreting their concern as self-serving, which spurs her growing resentment. In an effort to salvage her relationships, she reaches out to Holly, but the encounter only deepens their estrangement.
Desperation leads Rose to the unlikeliest ally: Joel, who introduces her to Robert Talley, the sole survivor of the curse. His harrowing story reveals the entity's sinister nature, preying on trauma to propagate its dark influence among those who have been directly affected by suicide.
Robert's grim narrative provokes a moral crisis within Rose, pushing her to confront the entity directly. After an unsettling visit with Madeline at home, where the entity masquerades as her therapist, Rose feels the weight of impending doom pressing down upon her, convincing her that her time is limited.
As her fears escalate, Rose abandons her efforts and returns to her childhood home, now a haunting reminder of her mother's passing. Nightfall brings the entity's grotesque apparition back, adopting a visage eerily similar to her mother, grinning menacingly. Fueled by resentment for her mother's legacy, Rose confronts the entity with an internal fury and ultimately sets it ablaze, fleeing the scene convinced she has triumphed over her inner demons.
Yet, as she takes refuge at Joel’s apartment, he oddly signifies a dark truth: there is no escape from the malevolent past. Reality distorts yet again, plunging Rose back into her childhood home, where the entity, in all its horror, captures her once more. Its form shifts into a grotesque mockery of her, forcing its way into her being, an inescapable nightmare that culminates in a chilling confrontation: Rose, engulfed in flames, wears a malevolent grin as her world shatters into chaos.
