The film opens with Malorie Hayes, portrayed by Sandra Bullock, urgently instructing two children known only as Boy and Girl, played by Julian Edwards and Vivien Lyra Blair, to keep their blindfolds on as they prepare for a perilous journey across the river. With a box containing her prized pet birds in tow, she guides the children along a string trail to their boat, emphasizing the critical need for caution in this dangerous new world.
Five years earlier, Malorie, an artist expecting her first child, is visited by her sister Jessica, portrayed by Sarah Paulson. Together, they watch a news segment detailing a wave of unexplained mass suicides that have rapidly spread from Siberia to Europe. Noticing Malorie’s painting, which represents a deep sense of disconnection, Jessica reassures her that motherhood will not be the same. After a light-hearted visit to the doctor with Jessica, where Dr. Lapham is played by Parminder Nagra, Malorie witnesses the outbreak's chilling arrival in America. This horrifying event catalyzes a spree of chaos, which culminates in a tragic accident that claims Jessica’s life right before Malorie’s eyes.
In her frantic escape, Malorie is supported by Tom, a character brought to life by Trevante Rhodes, who helps her seek refuge in a house with several survivors, including Greg (BD Wong), Charlie (LilRel Howery), Felix (Machine Gun Kelly), Cheryl (Jacki Weaver), and others. The group soon learns that they face an invisible force that drives people to suicide just by looking at it. As they board up their windows, Malorie confides in Tom about her sister’s fate, a moment that brings them closer together amidst growing tension.
In present time, the narrative resumes with Malorie navigating the dark waters while mysterious whispering echoes around her. The past reveals the harrowing moments when Olympia, played by Danielle Macdonald, desperately seeks safety with the group while the stakes continue to rise. Tensions fracture as they face dwindling supplies and hear foreboding sounds outside, signaling the continuing danger of the entity lurking just out of sight.
As the story unfolds, the group struggles against despair, confronting their internal demons alongside the external threats—Gary, played by Tom Hollander, and another man named Fish Fingers, whose desperation leads to chaos and tragedy within their midst. The narrative captures the fraught atmosphere as personal battles emerge, drawing lines of friendship and mistrust that threaten to unravel their tenuous sanctuary.
When confronted with devastating losses and newly formed bonds, Malorie finds a glimmer of hope. Despite the perilous journey ahead, she teaches the children survival skills, all while remaining shielded from the entity's coercive whispers to look. When the rapids threaten to tear them apart, Malorie’s strength allows her to guide Boy and Girl to a safe haven—a protected compound, revealing a community that offers solace and safety.
Finally, in a touching resolution, Malorie embraces her new role as a mother, naming her children for their lost loved ones—Olympia and Tom—and introducing her birds back into a world that still bears scars from their brutal reality. The story concludes on a hopeful note, showcasing resilience, the power of connection, and the enduring spirit of family.
