Cornelia wakes up in a remote manor house with no memory of how she got there or what she's doing there. When she walks around the old house, she meets Alex and 10 other girls in the same situation.

The group quickly splits into two camps. Alex and her group want to assist the sick, while Cornelia's group believes it's a hoax. The latter refuses to perform the tests and start looking for a way to get out.

The tense atmosphere between the two camps escalates; Cornelia is aware that Alex and her group will do anything to keep them inside the house.

Alex demonstrates that she is prepared to punish those who break the rules, and the atmosphere in the house becomes very hostile. Cornelia attempts to stay calm and keep a low profile.

The pressure on the girls increases. Cornelia and Alex start to doubt they did the right thing by going down their separate paths.

Several of the girls in the house display symptoms of viral infection. Everyone understands that the virus has gotten through the quarantine on the outside and made it into the house.