During a little league game, the Abbott family – wife Evelyn, husband Lee, deaf daughter Regan, and sons Marcus and Beau – and other spectators witness a strange asteroid-like object hurtle towards the Earth. The Death Angels, hostile extraterrestrial creatures that emerged from the asteroid, attack and begin slaughtering people. The blind creatures possess armored skin, have extraordinary speed and strength, and track victims with hypersensitive hearing, attacking anything that makes a noise.
Over a year later, the creatures
have killed much of the Earth's population. Regan discovers that high-frequency
audio feedback makes the Death Angels vulnerable, and she devises a makeshift
method of transmitting the noise from her cochlear implant through a
portable microphone.
With their home destroyed, the
family searches for other survivors. Entering a fenced-off area, Evelyn
accidentally sets off a sound alarm, alerting the creatures. As they flee,
Marcus steps into a bear trap, attracting a Death Angel with his screams.
Regan and Evelyn kill it, free Marcus, then run into an abandoned steel foundry.
An old friend, Emmett, appears and takes them to his soundproof underground
hideout. Emmett, who recently lost his family and developed a cynical outlook
on life, refuses to help further and says they cannot stay.
Marcus hears the song "Beyond
the Sea" playing on the radio, which Emmett says has aired continuously
for four months. Regan determines it is a hint that survivors are on a nearby
island. She theorizes that if she can reach the island's radio tower, the
hearing aid's high-frequency noise can be broadcast so other survivors can
weaponize the signal. She secretly ventures out alone to find the island.
Emmett finds Regan and saves her from a Death Angel. Regan persuades Emmett to
help complete her mission.
Evelyn leaves Marcus and her
newborn baby at the foundry to fetch medical supplies in town. Marcus discovers
the corpse of Emmett's wife. Startled, he alerts a Death Angel and accidentally
locks himself and the baby inside an air-tight compartment.
Emmett and Regan arrive at a
marina to board a boat to the island. They are attacked by bandits, and Emmett
deliberately creates noise and attracts Death Angels that slaughter the
attackers. When one creature drowns, he realizes that the creatures cannot
swim. The two row to the island where a small colony of survivors is living
normally. The colony leader reveals that when the government discovered the
creatures were unable to swim, the U.S. National Guard attempted to
move as many people as possible to the islands. However, the chaos from
boarding created noise that attracted the Death Angels, leaving only two boats
that made it to the island.
When Evelyn returns to the
foundry, she frees the children before they suffocate. The three hide inside
the bunker as the alien prowls the foundry. At the island, a Death Angel aboard
a boat drifts to the island and attacks the colonists. It kills the colony leader
while Emmett and Regan run into the radio station. Regan transmits the high
frequency through the room's speakers, incapacitating the Death Angel, and
impales its exposed head with a rod, killing it.
At the foundry, the creature
discovers the family. Marcus picks up Regan's transmission and plays the
high-pitched frequency through his portable radio before shooting the Death
Angel. Regan leaves the hearing aid connected to the radio station's
microphone, allowing the broadcast signal to be weaponized by others.



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