Journalist Angela Vidal and cameraman Pablo prepare to produce an episode of the daily life of firefighters. While working with them and recording, they met an old woman who locked herself in an apartment. However, when they were about to rescue the old man, she suddenly opened her blood basin and bit at a policeman. It turns out that she has been infected with an unknown virus. She bites when she sees a living creature, and people who have been bitten can also be infected with this virus. A policeman and a firefighter had been bitten, and the Colombian girl was also killed. In order to protect the rest, another policeman had to shoot and killed the old woman.
The residents here have an intern, a Japanese family, a middle-aged person living alone, and a Colombian girl, An old couple, Jennifer mother and daughter, and an old woman. There is also a perennial closed room in the attic, which is said to have been unoccupied for a long time. The mother and daughter had a dog named Max, who was taken to the vet because of illness. The people in the building wanted to send the wounded to the hospital as soon as possible, but the police blocked the entire apartment because the apartment had been infected by an unknown virus. Residents here have to wait for the arrival of professional medical staff, and only those who have been identified as uninfected can go out.
After the professionals arrived, the police and firefighters who were bitten were sent to the medical room on the first floor. However, during the inspection, the policemen and firefighters who were bitten turned into zombies, and everyone in the medical room hurriedly escaped, but the interns had been bitten. Regardless of everyone’s objections, the professionals locked the interns together with the police and firefighters. In the medical room. People were emotional, forcing professionals to confess the truth: The dog that was sent to the vet was found to be infected with an unknown virus. It bit other animals like crazy in the veterinary hospital. This virus can be spread through saliva. And that dog is Max. Everyone hopes that Jennifer's mother will hand over her daughter, but she insists that her daughter only has tonsils inflamed. Jennifer went mad suddenly, bit her mother and ran upstairs. The police locked Jennifer's mother by the stairs and ran upstairs to look for Jennifer. Firefighters and photographers also rushed upstairs. After finding Jennifer, the police were bitten while injecting her with a tranquilizer. The police dragged Jennifer and told the firefighters and photographers to flee. At this time, the firefighters discovered that the damned old woman was actually preparing to attack them. After breaking free of the old woman, the firefighter and photographer ran downstairs.
At this moment, the people in the medical room were completely mad. People found that the iron gate could no longer contain the mad people, and ran upstairs to take refuge in a panic. But Jennifer's mother was still locked by the stairs on the first floor, and people abandoned her. The frightened people ran upstairs. Reporter Angela, photographer Pablo, professionals, and firefighters escaped the crazy crowd and went to the middle-aged man's home, hoping to get help from the professional, but they found that he was also bitten. The professional locked himself up with the remaining sane. However, that iron gate doesn't work at all. People want to go out, but the government has let them down again. At this time, the middle-aged man said that the doctor’s room had a key to the basement, and that there was a sewer that could go out in the basement. Before finishing talking, the middle-aged man was caught and killed by a professional locked behind him. Angela, Pablo, and the firefighters rushed to the doctor's room. At the same time, they found that everyone in the building had been bitten. In order to survive, firefighters stood guard at the door, and reporters and photographers went into the doctor's room to find the keys. When they finally found the key, they found that the firefighter was missing. Then on the stairs, they found that the firefighter had been bitten like everyone else, and everyone was rushing towards them. In desperation, the reporter and photographer ran to the attic and opened the door, but they were also trapped in the attic. They discovered a secret in the house: Many years ago, the original owner here was appointed to conduct a dangerous study in this building. He locked up a girl and used her to do experiments. This girl may carry the virus source that infected this building. For various reasons, she was inhumanely abused, and the person in charge of the research may have died. Reporters and photographers found the girl who was still alive, and in the end, they couldn't escape either. At the end of the shot, the reporter was dragged away by the girl locked here. The whole movie also ends with the reporter's "Pablo, have you filmed it? It's all down!", leaving only this tape.
