In the near future, Europe has fallen victim to an apocalyptic catastrophe, leaving only a
handful of survivors behind. There’s a mysterious force around capable of manipulating people into
ending things for themselves, and this force is spreading through the whole world. In a skating
rink in Barcelona, Sebastian and his daughter Anna are seeking refuge and taking a moment to
have some fun together. However they suddenly hear a noise and begin running away. When they
take a sudden turn in a corridor, Sebastian is hit by a group of blind people and falls
to the ground. After hitting Sebastian a couple of times, the group takes his bag with supplies
and leaves. Sebastian finds a broken bottle on the ground and considers using it to defend himself,
but Anna tells him not to do it. Afterward, the duo covers his eyes and comes out of the building,
finding the streets destroyed and full of bodies as usual. After some walking they come across a
group of fellow survivors, so Sebastian tells Anna to hide before asking the group if they
can join them. The group is worried that Sebastian could pose a threat to their safety, so Sebastian
explains he used to be a construction engineer, claiming that he knows where to find generators
that can provide light and indoor heating; this gets him to join the group. The party
takes Sebastian to a bus station where they’re hiding with other survivors and meets Liliana,
a doctor who tends to his injuries. Later over dinner, he also meets a guy who stitched his own
eyes for protection and for his own sanity, and he shares a story of the horrible things
he’s seen people do while being under the effects of the entity. This guy reveals that while most
people fear the entity, others remain unaffected and possess the ability to wander around the city
without the need for blindfolds; these people are known as the “seers”. However those who are not
immune to this become targeted and killed by those seers. After dinner, all the people fall asleep
inside the bus and Sebastian sees an opportunity. He sneaks around and steals all the keys from the
office, then he starts trying them all out on the bus. Liliana is woken up by the noise and tries
to stop him, but Sebastian locks the driver’s door and says he’s doing this to free them all. When he
finally finds the right keys, he begins driving the bus rather clumsily all over the station,
waking the group up. The other survivors force the door open and begin attacking Sebastian to
make him stop, but this only makes him drive worse and eventually he crashes through the front door,
making it outside only to crash again and cause the bus to flip. As soon as Sebastian crawls out
of the bus, he says the entity is coming and calls it beautiful. The first guy is taken by surprise
and when he sees the entity, he immediately ends things for himself, and Sebastian sees how a light
leaves his body. Liliana and the others come out with their eyes closed, but Sebastian immediately
forces them to open them to look at the entity. Using different violent methods, one by one all
the survivors except Sebastian proceed to end things for themselves. Sebastian watches how
glowing lights leave their bodies and ascend to heaven while suddenly Anna shows up again
and holds her dad’s hand, saying it’s fine because he’s saved them. Suddenly there’s a flashback to
nine months earlier when Barcelona first succumbed to the attack of this unknown entity. Sebastian
had been in the middle of work when he got a call with the alert, and people in the office
were already ending things for themselves without a warning. His wife called him to ask him to pick
up Anna from school, so Sebastian ran to the streets, where people were fleeing desperately
for their lives in utter panic and chaos. When he ran to the subway station, Sebastian noticed lots
of hurt people and at that moment, objects began floating around him. Sensing something is wrong,
Sebastian ran away while people fell victim to the entity’s power. Then Sebastian returned to the
streets, where a building exploded. Eventually he made it to the school, where he found a dead nun
on a desk and all the girls backing away in fear. Sebastian found Anna and they ran away together,
but when they made it to the entrance, something outside exploded and started a fire. The duo tried
to leave through the school chapel instead and bumped into the school's pastor Esteban. This
pastor believed that the entity was an angel, and its divine presence made it impossible for people
to look at it. In order to prevent further suffering, Esteban suggested that humanity
should be freed from the confines of life itself. This notion profoundly affected Sebastian. Next,
Sebastian covered Anna with his jacket and ran to their apartment building,
only to see Anna’s mom crossing the street and getting run over by a car. Back in the present,
Sebastian and Anna stop at the church for a quick prayer, and Sebastian sees a painting move,
confirming he’s a seer that is so delusional that he sees things and thinks killing people through
the entity means he’s saving their souls. When the duo returns to the streets, they encounter people
ending things for themselves again, and Sebastian tells them the entity is beautiful angels before
watching the glowing lights leave their bodies. Sometime later, Sebastian sees a woman entering
a store. He tries to sneak around to attack her, but suddenly some dogs attack Sebastian first,
revealing a whole group of survivors led by the dogs’ owner Rafa. The group consists of Octavio,
couple Roberto and Isabel; Claire, and Sofia, a young German girl that reminds him a lot
of Anna. Sebastian asks to be accepted into the group and Rafa hesitates at first, but Sebastian
quickly buys them over with the generator story again. When objects around them begin floating
to announce the arrival of the entity, the group immediately leaves. Later they make it to their
hiding place, which is an old antiwar shelter. Sebastian tells the group that he’s alone although
Anna continues to appear in the background, telling him he should make everyone come out
by using the girl. Suddenly Sebastian admits he lied about the generator and a fight ensues,
but Sofia cuts in to stop them because she doesn’t want any more people getting hurt. Sebastian knows
German and manages to communicate with her, learning that she got separated from her mother
during their trip to Barcelona and how she had to watch lots of people die when the incident first
started. Sofia also mentions having heard from a broadcast about a mountain castle that is believed
to be the safest place from the entity, she also sketches a picture of the castle and a cable car
that leads to it. Seeing the drawing, Isabel deduces that Sofia is referring to Montjuic.
After arguing over the pros and cons, the group agrees to travel there, hoping that they’ll find
food and safety within the castle’s walls. That night before they leave, Sebastian has
a very weird nightmare about everything he’s gone through. In the morning, they start making their
way to Montjuic, only stopping once to get a map. Being outside again brings back another flashback,
showing Sebastian eight months ago using the voice from his GPS to guide him to the hospital,
where he asked for a doctor for Anna who had a fever. Suddenly things started floating, and
Sebastian had to go back to the apartment without a cure. Back in the present, the group stops to
rest for the night, and Sebastian continues to see Anna following them from afar. Once everyone has
fallen asleep, Sebastian uses the chance to damage the dogs’ leash. The next morning on the streets,
the group is suddenly surrounded by the entity, which uses the voice of people’s lost loved
ones. As everyone begins feeling confused and distracted, the leash breaks and the dogs run
away. Sofia hears her mom telling her to uncover her eyes, but Octavio stops her just in time. Rafa
is searching for his dogs and when he hears them crying in pain, he removes his blindfold, only to
see the entity and immediately die. The dogs come to check on him and so does Roberto, only to get
bitten by the animals. At that moment, Octavio finds a house they can use and blows his whistle
so everyone can follow him inside. While Isabel takes care of Roberto’s wound, Octavio shares his
theory: he thinks the entity is a quantum being existing within a fluctuating compound and capable
of reading human emotions, particularly fear and grief. This makes Sebastian start having doubts,
but when he discovers Sofia won’t stop crying, he gifts her Anna’s necklace. This causes another
flashback to start. Esteban and his followers were on the streets forcing people to open their
eyes to free them, and Sebastian did his best to protect Anna from the sound of death by keeping
her in the apartment with music. Back in the present, Sebastian keeps seeing Anna around,
which confirms she’s an apparition and not real. Claire tries to bond with Sebastian,
reminding him that the entity uses their loved ones to manipulate him at the same time Anna’s
apparition keeps talking to him. This makes his doubts worse. Suddenly Roberto passes out because
his wound is infected, so Octavio, Sebastian, and Claire begin investigating the building to find
medicine. In a room with an open window, Sebastian sees Anna again and tells Octavio to come over,
claiming the window is closed. Octavio comes while uncovering his eyes and sees the entity,
causing him to immediately end things for himself. This time, Sebastian can’t see the light emanating
from Octavio’s body because of the doubts he’s started to harbor. Things begin to shake as Anna
urges Sebastian to take off Claire’s blindfold, but thankfully Claire drags him out of there
before it gets worse. They go back to the couple and Claire shares what she’s found in the bathroom
with Roberto while Sebastian tries to decide if listening to Anna or Sofia. Later, the few
remaining members continue their journey through the city toward Montjuic. Sebastian notices there
are bodies with Esteban’s mark all over the place and suddenly they find their way blocked by a seer
on a bike. The group tries to run away, but the seer hits Roberto and Isabel, making them fall.
Knowing there’s no escape, the couple removes their blindfolds to die together before the seer
can take them. Noticing the entity is coming, Sebastian drags Claire and Sofia into a safe
building. Claire finally notices that Sebastian’s goggles aren’t actually dark, meaning he’s a seer
too and he killed the others. She immediately takes Sofia and they run away, so Sebastian chases
them after Anna keeps urging her to kill them. Claire and Sofia run upstairs and reach the roof,
but Sebastian corners them and pushes Claire before reaching for Sofia’s blindfold. However
before he can take it off, he sees Anna again and notices she’s bleeding. This makes him feel guilty
over his actions, and Sebastian ends up hugging Sofia instead while another flashback takes
over. Months ago, Sebastian and Anna were in the apartment celebrating her birthday when suddenly,
someone broke in and knocked Sebastian out. When he woke up, he was on the roof with Anna, Esteban,
and his followers, who forced Anna to open her eyes and die to the entity. After watching his
daughter die, Sebastian looked at the entity too and suddenly Anna’s apparition appeared next to
him, urging him to free more people. It turns out seers are alive because the entity uses them to
get more victims. Back in the present, Sebastian rescues Claire, then to earn her trust once again,
he tells her about Anna and explains he’s snapped out of it now, so he swears to protect them. At
that moment, the seers break into the building, and the trio tries to escape through the roof.
A woman comes after them and engages in a fight with Sebastian, trying to ruin his eyes. However
Sebastian is stronger and pushes her away, causing her to fall and die. Afterward the trio makes it
to the streets and steals a car to escape just in time before the seers can break through the
windows. However Esteban and his people have their own vehicles and start chasing them through the
city. Sebastian drives as fast as he can while ignoring Anna’s ghost, and when they reach the
cable car tower, they leave the vehicle and Sebastian makes it explode to kill a few seers
that catch up to them. Then Sebastian tells Claire to take Sofia and go on while he holds
off Esteban. As the men argue over philosophy, Claire leads Sofia up the old stairs and Sofia
almost falls through a broken step, but thankfully Claire picks her up just in time. There’s no way
to do this while blindfolded, so Claire decides to risk it and take hers off. When they finally make
it to the top, Claire discovers that the cable cars are not operational. Thinking quickly, she
rings a large bell to create vibrations, luring the entity towards them. As the creature arrives,
the surrounding environment begins to tremble, including the cable cars. Claire covers her eyes
again as the entity desperately tries to entice them by mimicking the voices of their loved ones,
but when Sofia is about to fall, Claire saves her just in time. Meanwhile on the ground, Sebastian
sees Anna walk through the car on fire and attacks her to get rid of this painful vision, only to
discover it’s Esteban and he stabs him with an iron rod. Esteban immediately stabs Sebastian
back, and both men keep pushing their weapons not to let the other go. Up in the tower, Claire
concentrates with Sofia in her arms and jumps into one of the cable cars, landing safely and finally
getting to escape. Esteban dies from the stab wounds and so does Sebastian but first, he sees
the cable cars moving, so he dies in peace knowing he helped his friends. Moments later, Claire
and Sofia reach the castle and are met by the military. They discover there is a whole community
living here, and Sofia finally gets to reunite with her mother. Meanwhile Claire is taken to a
laboratory, where she undergoes some blood tests. Claire questions the other researchers about the
purpose of the tests and they explain that they have been attempting to find a chemical indicator
of trauma and precisely determine the emotions targeted by the entity. The goal is to develop
an antibody that would provide immunity against the creature. Sometime later, researchers inject
the antibody into rats and place their cages inside a containment room. During this process,
a seer that appears to be one of the experimental subjects is lying in bed. Suddenly, a menacing
growling sound emerges from the containment room, and the seer desperately demands to see it.