After a year, most of Earth's human population has been annihilated by blind creatures with hypersensitive hearing that attack anything making noise. The alien creatures are covered in armor-like skin that is impervious to bullets and explosives. The Abbott family – wife Evelyn, husband Lee, deaf teenage daughter Regan, and younger sons Marcus and Beau – silently scavenge for supplies in a deserted town. Going barefoot while outdoors, the family communicates in American Sign Language. Inside a store, four-year-old Beau is drawn to a battery-powered space shuttle toy, but Lee takes it away due to the noise it would make. Regan returns the toy to Beau, who also takes the batteries that his father removed from it. Beau activates the toy when the family is crossing a bridge, alerting a nearby creature that kills him. Over a year later, Regan struggles with guilt over her brother's death, Evelyn enters the final stages of pregnancy, and Lee fruitlessly tries to make radio contact with the outside world. Lee attempts to upgrade Regan's cochlear implant with scavenged miniature amplifiers to restore her hearing, but the devices are ineffective. Later, Lee takes Marcus to a nearby river with a large waterfall to teach him to fish, while Regan sneaks off to visit Beau's memorial. Lee tells Marcus it is safe to talk when louder background noise masks their voices from the creatures. Marcus says that Regan blames herself for Beau's death and needs her father to tell her he still loves her. Alone at the house, Evelyn goes into labor. While making her way to their basement, she accidentally steps on an exposed nail with her bare foot and drops a glass picture frame, alerting a nearby creature. Evelyn flips a switch that changes the exterior house lights to red as a signal to the others and struggles to remain silent during her contractions. Arriving at the farm and seeing the lights, Lee instructs Marcus to set off fireworks as a diversion. Lee finds Evelyn hiding in the bathroom with their newborn son. They make their way to the improvised soundproofed basement. Lee leaves to find the other children. Evelyn falls asleep but awakens to discover the basement is flooded from a broken water pipe and that a creature is inside with her.