Angela (Jennifer Carpenter), a female anchor of a TV station, was a little nervous when she appeared on camera for the first time because she was going to participate in a program where she would spend the night with the firefighters at a fire station in Los Angeles. Angela was enthusiastic and cheerful, so she gradually integrated into the team. She not only understood everyone's personality, but also quickly became their happy fruit. However, after suddenly receiving a 911 alarm call, Angela followed the group of firefighters to the scene of the accident. In this eerie building, women's shrill screams were heard from time to time. The local police had blocked the building. The firefighters tried to evacuate the trapped people, but they accidentally got into trouble. In the isolated area, a woman was infected with an unknown virus and cruelly hurt many people. Seeing the firefighters suffer misfortune, Angela, who was unable to protect herself, was forced into a desperate situation...