The film opens 89 days after an alien invasion devastates the planet and
wipes out most of humanity The monsters are blind but have strong hearing
so they hunt wherever they hear noise The Abbott family's parents Lee and Evelyn,
plus children Regan
Marcus and Beau
go into the deserted town away from their home to search for supplies
They make as little noise as possible and communicate entirely through sign language
Evelyn finds medicine for Marcus who is ill Beau finds a toy rocket that he wants to play with
but Lee removes the batteries because it would be too noisy
Regan gives Beau the rocket and he takes the batteries when nobody is looking
The family walks back toward their home by following a dirt path that would obscure
the sounds of their footsteps As they reach the bridge
Beau puts the batteries in and turns the toy on it is making loud noises
Lee runs toward Beau as he hears one of the monsters running through the woods
Before Lee can reach Beau a spider-like monster leaps out
and snatches Beau Over a year later
the family continues to thrive by remaining as quiet as they can
Evelyn is pregnant with a fourth child Lee has developed a hearing
aid for Regan who is deaf by using spare parts gathered from radio equipment
Unfortunately, this, along with previous attempts at creating a device, fails to allow Regan to hear
The kids play Monopoly when Marcus accidentally
knocks over a lantern, causing it to shatter and create a small fire that Lee quickly pulls out
They wait anxiously to hear if the monsters are close
but they never come Later, Lee and Evelyn
listen to a song on a device and share a dance Lee takes Marcus to go fishing by the falls
even though he is scared of being out there Regan volunteers to go
but Lee tells her to stay and help her mother It is clear that there are
tensions between Lee and Regan When Lee and Marcus get to the falls
Lee assures Marcus it's safe to talk there since the sound of the river is louder
than the sounds they can make They are then able to speak to
each other for the first time in a while Marcus tells Lee that Regan blames herself
for what happened to Beau and he asks his father if he feels the same way
Lee denies it Marcus asks him if he loves Regan
and says you should tell her that you love her Regan leaves the house
and she walks toward the bridge where Beau died As Lee and Marcus start walking back home
they come across a man standing over the mutilated corpse of a woman who may have been his wife
Despite Lee trying to get the man not to do anything
but the man screams to attract the monster Lee and Marcus hide as the man is killed
Back at the family's farm Evelyn's water breaks
She heads to the basement to prepare as it is soundproof
but she steps on a nail on the staircase
causing her to yelp in pain and drop a family picture that shatters
The noise draws one of the monsters to the house Evelyn turns on the red lights for Lee to see
alerting him to the presence of the monsters The creature stalks Evelyn in the house
but Lee sends Marcus to set off some fireworks to send the monster away
Evelyn is finally able to scream from the pain of the contractions
and she is bleeding heavily Lee runs back to the house
to find that Evelyn has given birth to a boy He carries the two of them to the basement
and puts an oxygen mask on the baby and places him in a box so that the
monster won't hear him crying Lee and Evelyn are able to talk
as she has also felt guilty for Beau's death saying she could have carried him the whole way
She tells Lee to promise he will protect the children
Regan, who was resting by the memorial sees the fireworks go off and she
rushes back to the home Marcus runs through a crop
field as he hears one of the monsters approaching He gets knocked out when he runs into a tractor
but he is found by Regan The two go to the top of a
grain silo to signal Lee to find them but the winds put out their fire
Marcus then falls through the roof of the silo and is nearly crushed by a metal door
Regan jumps in after him and the two nearly suffocate under the grain
A monster then jumps in, but the kids hide under the door
Regan's hearing aid then lets out a strong high-pitched frequency,
that weakens the monster and sends it away In the house, the basement starts flooding
One of the monsters hears the water running and comes close
Evelyn quietly moves through the water as she attempts to reach the baby
The noises from outside send the creature out Regan and Marcus jump
out of the silo and reunite with Lee However, the monster is close by The kids
they hide in a truck while Lee attempts to fend off the monster
It whips its claw at Lee and severely wounds him Marcus cries out for his dad
which the monster hears Lee sees the children and signs to
them that he loves both of them, and always has He then screams to attract the monster
and it kills him Evelyn witnesses this through the security cameras
The kids drive back to the house and run into Evelyn's arms
all of them mourning Lee's death They run to the basement for safety
Evelyn keeps Marcus in the corner to protect the baby
Regan sees Lee's notes and equipment that he used experimentally against the creatures
One of the monsters then makes its way into the basement
as Evelyn arms herself with a shotgun Regan realizes that her hearing
aid is strong enough to weaken the creature
so she uses it to produce a powerful frequency that causes the monster's head
to open and writhe around in pain and Evelyn blasts the monster's head off
This alerts another pair of monsters who quickly make their way toward the house
as Evelyn sees on the cameras However, now that they know how to fight back
Regan turns up the volume on the microphone, and Evelyn, with a smile, cocks the shotgun