During a kart race, Leila is having trouble concentrating and ends up losing,
leaving her in tears. Racing is very important to her because her brother Aysam used to race too,
but he was in an accident that sent him to the hospital and now Leila feels the responsibility
of winning for him. Her relationship with her parents has become distant since the accident,
and whenever she needs encouragement, she touches the bracelet her brother gifted her. One morning,
Leila is going for a run with her gym class when she comes across a student bullying another rather
violently. Leila's friends tell her she shouldn't get involved, but when the bully insults her
brother, Leila loses it and kicks the bully in the face. After class, her friend shows concern about
Leila's mental stability and offers her support, but Leila wants to be left alone. In the evening,
she decides to go to the amusement park to distract herself and forget about what happened.
Meanwhile the news shows the kidnapping of a young man called Saul is current again ten years later
because a body has been found and there's a high chance it could be him. The next day,
Leila wakes up to find her phone has no signal and the wi-fi is down, and when she comes downstairs,
she discovers her whole family is gone as well. Desperate for answers, Leila hits the streets on
her bicycle, but this turns out to be a city-wide phenomenon and she can't find a single living
soul. As soon as she makes it to the hospital, she confirms even Aysam has disappeared. Not knowing
what else to do, Leila keeps exploring the city asking for help and eventually she manages to
find two kids, Terry and Camille, who have gone through exactly the same: their phones don't work
and they haven't seen anybody else. Deciding to stick together for safety, the trio goes
to the police station while unaware something is watching them from afar. Communications in
the station are down too but they do manage to find a guy named Dodji, who is in handcuffs. The
trio releases him and tries to explain to him what they know so far, but Dodji doesn't want anything
to do with strangers and hotwires a bike to get away. After getting their hands on some bicycles
and a gun from the police station, the trio keeps exploring the city, but it isn't until night falls
that they finally find something: on a bank's building, someone wrote SOS using the window
lights. The kids get into the elevator, which is stopped midway to allow a mysterious creepy voice
to interrogate them to know their intentions, it also makes them drop their bags and the gun
before allowing them to reach a floor and get out. The person behind the voice turns out to be Yvan,
the son of the bank's CEO. The group goes to the last floor to get a full view of the city,
but there isn't movement anywhere. Yvan also points out he doesn't remember going to bed
last night, making the others realize they have the same issue. Afterward, they take a very fancy
car from Yvan's father's collection to keep on exploring faster, although the GPS doesn't have
signal either. When they enter a tunnel, they're shocked to find Dodji on the ground with a wound
on his chest, someone had shot an arrow at him. Thankfully there's an ambulance stuck
in the tunnel too and they put Dodji inside to take him with them, which Yvan doesn't approve
of at first. However he quickly changes his mind when more arrows begin coming after them, meaning
whoever shot Dodji is still around and ready to kill. Driving the ambulance at a very high speed,
Leila takes the group to a fancy hotel, where she removes the arrow from Dodji's chest. Afterward,
the group decides to stay the night there and take advantage of its luxuries, although first
they make sure to block the front door. Moments later, it is revealed that the presence that has
been watching them it's a drone; the kids can't see it but they do hear a weird noise outside
the window and decide to share a room not to feel scared while they sleep. The next morning, while
making breakfast in the hotel's kitchen, they find a newspaper with an article talking about a
small leak at a nuclear plant just two kilometers away. A possible evacuation would explain the lack
of people, although the article is from two weeks ago. Their chat is suddenly interrupted by Dodji,
who has finally woken up and come to grab a bite as well, but he refuses to answer the group's
questions about what happened in the tunnel or to show gratitude to them for saving them. Yvan
finds this suspicious and Dodji misunderstands it as an attack on his race, so he stomps out of the
building to find another bike to get away. Leila and the others follow Dodji in a car, but they
can't even reach the edge of the city because they discover the entire area is surrounded by
a mysterious hot fog that burns your throat if you get too close. When Camille accidentally drops her
glasses, the fog melts them, and in Yvan's opinion this proves some kind of chemical accident,
meaning their families somehow left without them. Now that she doesn't have her glasses,
Camille can't see anything, so they drive to her house to get a new pair. At first Yvan doesn't
want to join them and prefers to stay in the car to work on the radio, but soon it starts raining
and he changes his mind. When he gets out of the car he accidentally hits the gear stick,
and the vehicle slowly moves away without the kids noticing. Inside the apartment, Camille finds a
spare pair of glasses, but it also finally sinks that her mother isn't around anymore, causing
Camille to furiously start wrecking the place because it actually belongs to her stepfather. It
isn't until Leila hugs her and offers her support that Camille calms down. Once they're done, the
group discovers the car is gone, but thankfully Leila finds it inside a very dark tunnel. To her
surprise, there are some noises coming from the radio, but the real shock comes from finding a
masked man in the backseat. This is Blade Master, the guy responsible for the arrows, and now he has
a knife that he intends to use on Leila. As soon as she sees him, she rushes out of the car and
rejoins the group so they can run away together. A wrong turn takes them to a road blocked by a fence
that they must climb, and during the process, Leila loses her beloved bracelet. Eventually
they find a bus with the keys still in it and they drive it all the way to the train station to take
cover there. While Yvan keeps trying to use the radio, Terry is looking at a video he took of
their enemy and realizes he's dressed as the Blade Master from the Steelman cartoon. Outside, the
drone continues to keep an eye on them. Suddenly, Leila realizes something: if Yvan has access to
everything in the bank, that includes the security vans, which should keep the group safe from Blade
Master. They drive it all the way to the edge of the city, intending to go through the fog,
but their plans are interrupted when someone finally contacts them through the radio. The voice
is surprised there are people left in town after the evacuation and promises to send help in 24hs,
it also asks them not to go into the fog. The kids tell the rescuer they'll be waiting at the
hotel and drive all the way back to spend the night celebrating the end of this mess with a
toast that even prompts Dodji to finally thank them for their rescue. When Leila goes to sleep,
she dreams she's back in the hospital, hearing Aysam calling her name and saying he's in pain.
Just when she's about to reach his room, Leila is awakened by Yvan, who thinks he saw something in
the building and is afraid; he also reveals he's had a gun with him all along. Leila grabs the gun
and goes to investigate only to confirm Yvan is right, Blade Master is in the hotel too and is now
coming after her. Without hesitation, Leila runs away and hides in the storage room, locking the
door behind her and causing Blade Master to start stabbing the wood. He also begins shaking the door
itself and Leila begins to wonder if she'll have to kill a person, but before she can react, Blade
Master leaves and Dodji finds her instead. The two of them run up to the balcony and see Blade Master
running away from the building, so they agree not to tell the others not to worry them. In
the meantime, the drone finds a sleeping Camille in her room. The next morning, while everyone
relaxes, Dodji leaves on his bike claiming there's something he needs to do, but he'll be back in two
hours. Using a telescope, Terry notices the fog is coming closer, making Leila worry about Dodji's
safety and prompting her to go looking for him. Eventually she finds him inside a church leaving a
letter at a little altar. As soon as Dodji hears about the fog he agrees to return sooner than
planned, but he also has a surprise for Leila: he's recovered her bracelet, a gesture that Leila
finds very touching and inspires her to share her story. However before she can even say one word,
they see some fireworks in the sky coming from the hotel, meaning the kids are in danger. Dodji
and Leila rush back to the hotel, where Terry and Yvan explain they heard Camille scream. Her door
is locked, so Dodji forces it open with a fire extinguisher, but it's too late: Camille has
disappeared. At that moment, the drone appears in the hallway and asks the group to follow it
if they want to see Camille again. Driving the security van again, the group follows the drone
to an abandoned building, where only Dodji is allowed to enter. Leila doesn't like this idea,
so Dodji tells her she can come after him if he doesn't return in ten minutes. Before he leaves,
Leila gives him the gun and a tight hug. Dodji goes inside and is welcomed by the drone,
but five minutes pass and there is no news from him. Refusing to keep on waiting, Leila grabs a
weapon from the security van and rushes inside before the ten minutes are over. The building
is an abandoned lab filled with trash from wall to wall, including Steelman comics on the floor.
Unfortunately by the time Leila finds Dodji it's too late: he's already been killed. Blade Master
takes advantage of Leila's distraction to jump on her to kill her, but luckily Terry shows up and
knocks him out with a quick hit to the head. Then, Leila removes the mask and discovers this isn't a
man, it's a young neurodivergent boy called Remy. Moments later, after giving Dodji a proper burial
outside his church, the group ties Remy up and tries to make him confess Camille's location.
Remy won't talk and this makes Leila furious, even prompting her to want to kill the guy, but Terry
stops her just in time when he notices a sticker on Remy's clothes belonging to his mother's
association that helps people with disabilities. Remy can't talk because he's mute, and there's no
way a guy that depends so much on charity could've had the resources for this crazy plan. Leila
accepts not to kill him, but she doesn't release him either. Afterward, Leila checks the letter
Dodji had left there earlier and discovers he had written it for his mom to apologize for shooting
her husband. He wasn't evil, he had only wanted to scare him off because he hurt her. At that moment,
a noise startles everyone: the radio gets in contact again to know why they left the hotel.
The kids inform them they're in the church now and the voice starts laughing, calling him as
gullible as Remy, who he refers to with a slur. It had always been the real Blade Master talking to
them on the radio, which explains how he could always find them, and now he puts Camille on
so they can hear her cry for help. Suddenly, an explosion goes off outside and destroys various
sections of the church walls, allowing the fog to get inside. The kids release Remy and bring him
with them into the security van, which they use to escape. Once they're far enough from the fog,
they discuss where to go next while Yvan handles the radio, but he can't make it work again. In the
end, they park the van near a bridge and try to rest for a while before taking any decision. Leila
dreams of the hospital again and Aysam tells her to hurry, but before he can indicate exactly where
to, he screams in pain and Leila wakes in tears, clinging to Terry for comfort. Moments later,
the radio picks up some noises that sound like animals, which means Camille and the real Blade
Master must be in the amusement park. As soon as they make it there, they sneak into the tent and
confirm their guess is correct: Camille is there, locked inside a glass cage while wearing a long
white dress. The real Blade Master is there as well and turns out to be Saul, who should be dead;
he wants Camille to marry him and keeps referring to the members of the group with slurs. Remy
still has the blades from the costume and wants to attack, but Saul sees him first and kills him with
an arrow. Afterward, Saul explains to Camille how her friends will be caught by the fog and "burn
eternally in chaos in limbo" before dropping the cage to make the group come out of their
hiding spot. Saul isn't scared and comes face to face with Leila's weapon as he tells the story
of a fire breaking out near the amusement park and asks her to wake up. Leila can't take his
taunting and shoots him, but it just makes Saul laugh before he takes out a suspicious sheet of
paper from his pocket. While Terry and Yvan free Camille, Leila takes the paper with her to the
amusement fair as she finally begins to remember what happened the night before it all began. While
she had been having fun at the fair, she came across all the members of her current group,
and the fire caught them there. It turns out all five of them plus Remy are actually dead, and the
paper is a flier announcing an event in memory of the victims. Terry and Yvan come after her to warn
her the fog is coming closer, but they freeze when they discover the truth as well. Realizing people
can't die twice, Leila gets in a car and drives all the way back to the church to dig out Dodji,
who effectively is perfectly fine. When he asks for an explanation, Leila loses it and begins
laughing, mentioning how they're all dead and how they all probably are just part of her imagination
before running away. As soon as she finds the fog, Leila lets her body fall into it and instantly
becomes unconscious, so Dodji picks her up and goes to find the others in order to think of a way
to help her. While the group tries to locate some water to lower her very high body temperature,
Leila dreams of the hospital once more. This time she manages to reunite with Aysam, who tells her
to cross the limbo and cross the fog. At that moment, she wakes up thanks to her friends having
found a lake and dipping her in it. The fog keeps coming closer, but Leila knows what to do now.
The group goes back to the security van and after everyone puts on gas masks, Leila follows Aysam's
advice to enter the fog. For many long minutes, there's nothing but constant shaking and darkness,
and the van doesn't stop until they come across a source of light. The kids have finally crossed
limbo and reached heaven, which presents itself as a big open field with a huge building in the
middle of it. Inside, the group finds hundreds of other souls cheering for their leader who
turns out to Saul, and his presence makes the friends wonder if this is truly heaven after all.