In a gated island community in Montreal, a biotech company is hired to take care
of the fields of an exclusive golf club. They spray the area with their latest fertilizer,
which melts the snow and keeps the grass nicely fresh and green during winter so rich people
can play golf all year. The next day in town, security guard Dan brings a bunch of supplies
to his home. He’s an obsessed survivalist who is always practicing for the worst and is brainwashed
by a radio show that stands for every conspiracy under the sun. Tonight Dan is practicing how to
make a fire with no matches to no avail, so he grabs a shotgun shell to use its powder,
which causes a small explosion that burns one of his eyebrows. In the golf club, Dan’s daughter
Patricia works as a caddie while Michel, the CEO of the biotech company, plays golf with a rich
couple to show them how great the grass is doing thanks to their treatment. However underneath the
soil, the fertilizer particles are multiplying and contaminating the town’s water. At a studio,
an actor called Jacques has a glass of tap water before leaving to do some groceries. At the store,
all the fruit and tools are washed with tap water as well, and on the shelves water is sprinkled to
keep perishables fresh. Suddenly Jacques starts feeling a bit dizzy but ignores it for now. When
he arrives home, he notices that his teeth are turning green and his stomach is growling. By
the time he finds his wife in the bathroom, he’s a full zombie and bites the poor woman, eating her
flesh and making her transform as well. Jacques joins her in the tub as their eyes turn green and
they grind to a halt. Back in the club, Michel and the couple return to the main building and
are surprised to see nobody around. Suddenly a man runs out as he yells they must run because people
are sick, and soon a bunch of zombie employees come out to chase after him. At that moment a dog
also appears and the wife calls it over, but the animal furiously jumps on her and bites her neck.
Michel and the husband immediately toss the dog away, only to see more zombies showing up. While
the woman freezes as her body transforms, both men rush inside the building and lock the door
to keep the zombies out. However the dog manages to sneak in and bites the husband in the leg,
so they lock it up in another room. The zombies gather at the door and start pounding before the
husband also transforms and starts chasing after Michel, who rushes to hide in the kitchen after
grabbing a knife. In town, Dan gets a call from an old lady who says her neighbors are being extra
noisy and fighting a lot. Dan goes over there and when he rings the bell, the neighbors appear
against the door, revealing they’re zombies. At the same time, the old lady turns into a zombie
too and starts chasing after Dan, who immediately hides in his car and tries calling for backup,
but nobody answers him. As more zombies appear outside his window, Dan also tries calling
Patricia, but she doesn’t answer either because she’s busy trying to escape from the zombies.
Getting worried, Dan decides to ditch the company car and get his car with a weapon to go looking
for his daughter. Nearby, teenage boy Andre almost uses tap water to make his sister Annie's milk,
but his mom reminds him to use bottled water to keep the baby safe. Andre never drinks water of
any kind, preferring to stick to soda. Soon the mother starts feeling dizzy, but Andre blames it
on all her exercising. Moments later, the mother turns into a zombie and tries to attack Andre,
chasing him through the house. Terrified, the kid runs outside and trips, but when the mother
is about to reach him, Dan hits her with his car. She’s injured but still alive and Andre
wants to help her, but Dan stops him. He explains that 911 isn’t picking up and tells Andre to hide
in his house, then he leaves. More zombies are coming and Andre refuses to leave his mother, so
he grabs her by the legs and drags her back into the house. After rushing to close all the doors,
he tries calling 911, only to get a record message saying that the island is under quarantine. At
the bridge that connects the island with the mainland, it’s revealed that cops from the city
have put up a gate and nobody can go in or out. At that moment the mother tries to attack Annie,
so Andre drags her away and locks her up in the bathroom. The mother notices that the shower
head is dropping some water and decides to get inside the tub. Meanwhile Annie keeps crying,
causing the zombies to keep gathering outside the door. Andre decides to cover her with pillows,
a blanket, and even a big plushie until the crying can’t be heard anymore, and the zombies
leave. Minutes later, Andre’s cat returns to the house through the pet door and suddenly a zombie
reaches inside, almost grabbing Andre. The boy leaves the room and the zombie stops moving,
only to move again when Andre comes back with a golf club. He doesn’t attack though, preferring
to hide instead. At the golf club, Patricia hides in the garage and finally calls her dad for help.
Soon Dan arrives and finds a bunch of zombies outside but he doesn’t hesitate to fight them,
quickly killing a few with a knife and knocking down others before rushing inside. At that moment,
the police move away from the bridge gate because the military arrives in planes to bomb the main
areas of the island, which cuts off the power. The next morning, Annie’s nanny tries to take the
bridge to go to work, but it’s been destroyed too. Meanwhile Andre records the zombies through the
window, only stopping to watch a press conference of the Minister of Public Security. The man
explains they had to destroy the bridge to isolate the problem and swears the situation is under
control. At that moment, Andre’s phone runs out of battery. Afterward André checks on his mom and
notices she’s covered in some green goo. Suddenly Annie crawls in and the mom tries to attack her,
so Andre makes noise and shakes her favorite vegetables to make her follow him instead.
Eventually they reach the living room and the mom accidentally bumps against the TV stand, causing
the television to fall and kill her. Devastated, Andre has no choice but to take the body back
to the bathroom and notices grass growing on her injuries. He then grabs her phone, but sadly it’s
broken. Then Andre takes a ladder to the front door to look outside and confirms the zombies are
just standing there under the sun. Tired of the confinement, he grabs the golf club and puts Annie
in a baby carrier before opening the door, letting the zombies see the cat and chase after it. With
the entrance cleared, Andre runs as fast as he can toward the grocery store while the zombies
chase him. The doors are locked and he almost gets surrounded by the monsters, but suddenly a
door opens and Dan drags him inside. Dan has been here since yesterday and has made a little camping
space, but he doesn’t have a plan. All boats have been taken away and swimming in the river will
kill them with hypothermia. Andre goes looking for baby formula while Annie looks around and she
suddenly discovers a zombie behind locked doors. It’s Patricia, who has been infected as well. Dan
is keeping her around because he hopes someone may cure her later. At the golf club, Michel
has fortified all the doors and is using a radio to talk to his people at the company, who inform
him experts are on their way and he must follow protocol too. The zombie dog keeps barking at him,
so he kicks it away. It’s also revealed that he’s killed his friend in the kitchen. Back at the
store, Dan still fails to start a fire, so Andre just uses a blowtorch. While they eat something,
they listen to Dan’s favorite radio show, which blames the zombie attack on eco-terrorists. The
host gets to interview the Minister of Security, but the man is the typical politician who dodges
questions or answers with vague words that say nothing. Suspicious, the host thinks the
government will sacrifice the citizens to clean the area. Dan decides to call the radio station
and explain that there are survivors, asking for help. However the host points out the rest of the
world doesn’t want the infection so he wants to know what’s going on before taking anyone’s side.
Frustrated, Dan hangs up. Afterward Dan and Andre discuss their options and agree they should find
the cause behind this so a vaccine can be created. Dan thinks about it and comes to the conclusion it
must be in the water because it’s the only thing every single person has in common, and he doesn’t
drink it from the tap because of his paranoia. He even thinks terrorists may’ve poisoned the water,
which Andre finds ridiculous. Moments later, the trio leaves the store with Patricia, whose head
has been put into a cage to avoid biting. They find a bunch of zombies covered in green goo and
enjoying the sun, and a little girl attacks Dan as soon as she sees him. He quickly pushes her off,
but he doesn’t have the heart to kill her and keeps going. The group manages to get into Dan’s
car before the zombies catch up and safely leave the area. Meanwhile a pair of armed twins sent
by the biotech company arrive at the golf club and shoot down every zombie that tries to get in their
way without breaking a sweat. Inside, Michel is burning all the contracts and documents related
to his deal with the club, but he keeps a small sample of the fertilizer. The twins soon find
him and Michel takes one of their suitcases, which contains spheres with the cure that will kill the
infection within twenty-four hours. When he grabs a sphere, the twins capture him and force him
to eat the fertilizer sample before knocking him out. As they drag his body away, the sphere drops
to the floor. Back to the survivors, they arrive at the water plant and decide to leave Annie in
the car or her crying will attract zombies. They can’t leave Patricia with the baby, so
Dan and Andre bring her along when they enter the building, where a grassy zombie is hiding in the
water. Patricia senses this and begins running to find him, so the guys have no choice but to follow
her. She quickly finds the pool and jumps into it, causing Dan to jump as well to rescue her.
Suddenly the other zombie resurfaces and almost attacks, but when Dan finds Patricia, he holds her
in front of him and the other zombie pulls back. Andre comes closer and realizes the zombies won’t
attack each other, but the monster hears him and immediately starts chasing him. While Andre goes
outside and more zombies join the chase, Dan tries to get Patricia out of the water and accidentally
tears off her arm. Eventually Andre reaches the car to hide inside and soon Dan comes out too,
using Patricia as a shield to keep the zombies at bay. They join the siblings in the car and Andre
hears a noise that makes him realize Patricia also has a phone. He takes it and uses her severed arm
to unlock it, which makes him notice that grass growing on the wound. Dan thinks grass in winter
is weird until he remembers the golf club’s latest innovation, realizing this isn’t the work
of terrorists but of golfers. At the golf club, the twins begin breaking the spheres on the grass
to get rid of all the evidence. Soon Dan’s group arrives and they notice the strange smoke on the
grass, so Andre makes sure to record everything. They rush to the front door and find it locked,
so Dan looks for another entrance. He climbs to the roof and gets inside to open the door for
the others, then locks Patricia in the storage room while Andre uses chairs to form a playpen
for Annie. Dan and Andre begin investigating the building and find the dog, which is still
breathing and covered in grass. At that moment Dan starts feeling dizzy and Annie begins crying,
so Andre rushes to her calm her down. However he discovers she’s escaped the improvised playpen.
While Andre looks for his sister, Dan goes down a dark corridor and discovers a bunch of bombs that
will blow up the building soon. He also begins feeling worse, but he refuses to give up and
keeps going until he finds the room with the timer that connects to all the explosives. Dan falls and
is too weak to stand up, so he uses Patricia’s arm to stop the timer right before his eyes turn
green too. Outside, the twins notice nothing is exploding and go back inside to investigate.
They find Annie in the kitchen and feed her the fertilizer before leaving. Andre keeps looking
around and sees a zombified Michel in a locked room, so he runs in the opposite way and finally
finds his sister, so he takes her away. In another room, he finds his way blocked by the twins,
who cover Annie’s mouth and grab Andre to feed him the fertilizer. However before the sample drops,
Annie becomes a zombie too and bites the twin’s finger off. The other twin is almost attacked by
Dan and when she fends him off, Andre pushes her toward him and Dan bites her. When Andre moves
back, he steps on the cure sphere, causing the smoke to spread through the room and start working
inside Dannie and Dan. Afterward Dan chases after Andre and they make it to the kitchen,
but when Dan is about to bite him, he senses Annie’s presence and pulls back. At the same time,
the twins take out their guns and shoot each other simultaneously before one can
finish transforming. Next, Andre takes Dan’s old-school phone from his jacket and uses it
to make Patricia’s phone ring. When he finds it, he makes a video explaining everything,
begging for help. While the video reaches the news, Andre takes Dan to the storage room so he
can stay with his daughter. Soon the government sends army helicopters to do some deep cleaning.
A group of soldiers uses flamethrowers to burn down any zombie in their path and Andre goes
out to ask for help, bringing Patricia’s arm to be used for vaccines. However another survivor
reaches the soldiers first only to be shot down. As the cure kicks in and Annie gets better,
Andre decides to hide since obviously the soldiers aren’t here to save anyone. At the golf club,
Dan also recovers, but when the soldiers open the door they immediately burn him and Patricia
down. The Minister of Public Security announces that the infection has already been contained
and eliminated, but he’s seen drinking from a mug with the logo of the biotech company, implying he
was part of the conspiracy all along. Andre keeps wandering around, finding more bodies of survivors
that were shot down. Suddenly he notices something in the river: it’s a boat of volunteers led by
Annie's nanny, who rescue him without hesitation. As they leave the island, Andre realizes the arm
is useless now and throws it in the water, where a fish takes a bite and quickly becomes a zombie.