What is the plot?

What is the ending?

At the end of MadS, Julia is the last of the three central characters still moving through the chaos, but she is left alone, surrounded by an infected city, and handed a weapon as the night collapses around her. The ending is bleak: the people closest to her are dead, transformed, or gone, and she ends the film in shock, crying and laughing at once.

Here is the ending in a simple, chronological narrative:

Julia reaches the apartment building while the situation outside is already breaking apart. The power is out, the halls are tense, and the sounds of violence and panic are all around her. Anaïs is no longer a person Julia can safely face; she has fully become part of the horror spreading through the building and the city.

Julia gets into the building and keeps moving upward, trying to survive long enough to reach safety. Outside, the armed commandos are already operating in the streets, treating the infected as a deadly outbreak.

Alice, Julia's sister, tries to help her, but Alice is killed by the paramilitary forces before she can get Julia out. This leaves Julia with no family help and no real escape route.

Julia makes it to her mother's apartment. There, she finds Anaïs consuming her mother in a brutal, physical attack. Julia has to flee again, now seeing that the people she loves are either dead or beyond saving.

She is stopped by a masked commandos member named Noa. Noa tells her to stay quiet and searches for Anaïs, trying to control the situation as if there is still a chance to contain it.

Anaïs attacks Noa and bites her. The commandos member then overpowers Anaïs and shoots her repeatedly in the head. This is the final destruction of Anaïs as a living person in the story.

After realizing she has been bitten, Noa removes her mask, gives Julia her rifle, and kills herself. Julia is left standing there with the weapon, forced to face the ending of the night on her own.

In the final moment, Julia sits or slumps by the window while the city behind her is filled with gunfire, explosions, and collapse. She laughs and then breaks down screaming and crying, alone with the rifle and the full weight of what has happened.

The fate of the main characters at the end is this: - Julia survives the immediate events, but she is left isolated, traumatized, and holding a weapon with no clear protection or guidance. - Anaïs is killed after attacking Noa and being shot in the head. - Romain has already been overtaken by the same infection and is part of the wider collapse that has consumed the night. - Alice is executed by the paramilitary while trying to help Julia. - Noa is bitten, realizes she is infected, and shoots herself. - Julia's mother is found being eaten by Anaïs, so her fate is effectively death in the chaos of the final sequence.

Is there a post-credit scene?

Who is Romain, and how does his drug use trigger the events in MadS?

Romain is the film's starting point: a teenager who visits his dealer to try a new drug before going out for the night, and then drives home in his red Mustang convertible. The story shifts into horror when he picks up a bloodied, bandaged woman who crawls into his car, and the chaos that follows begins with that encounter. Sources describe Romain as the first character through whom the film's infection, mania, or outbreak-like spiral takes hold.

Who are Anaïs and Julia, and what roles do they play in the story after Romain?

Anaïs and Julia are the film's other main protagonists alongside Romain, and the narrative is described as following the three of them in sequence as the night unravels. After Romain's initial spiral, the film "takes turns" carrying the story through Anaïs and Julia as each becomes caught in the escalating violence and panic. Their role is central because the film is built as an interpersonal drama among these three friends, not just a creature- or outbreak-centered horror story.

What is the bloodied and bandaged woman who gets into Romain’s car, and how does she affect him?

The woman is the key inciting figure in the opening stretch of the film: she is bloodied, bandaged, and crawls into Romain's car after he picks her up. Sources indicate that this encounter is the point where events "soon spiral downhill," and later descriptions suggest she is tied to the strange contagion, mania, or infected state that spreads through the story. The film keeps the exact cause of her condition deliberately unclear, but her arrival is what launches the film's chain of horror.

How are the three friends connected before the nightmare begins, and why does that relationship matter?

The film centers on the relationship between Romain, Anaïs, and Julia, who are presented as friends whose personal dynamics matter as much as the horror around them. One review explicitly calls MadS "an interpersonal drama between three friends," and another describes the story as unfolding through their separate but connected journeys through the same night. That friendship structure matters because the emotional stakes come from watching people who know each other well make increasingly desperate decisions under pressure.

What happens to the people around Romain, Anaïs, and Julia once the contagion or madness spreads?

As the film progresses, the strange condition affecting Romain is described as contagious mania or a contaminant that drives infected people into erratic, violent behavior. One source says that each main character encounters someone infected by this contaminant and is drawn into random acts of violence, while another says the city is at risk as the situation spreads from a house party outward. The surrounding people become part of an escalating chain reaction, turning the film into a broader citywide nightmare rather than a single isolated incident.

Is this family friendly?