When Mark, an unsuccessful artist estranged from his wife and son, wakes to see the doors and windows of his flat sealed shut, which he thinks it's a sick joke initially. Then he realizes strange figures outside putting on protective suits - 'Hazmats'. They claim him to remain calm and everything is still under control, but tempers fray and fright takes over as the 'Hazmats' infiltrate the building and begin grabbing residents. Together with his neighbors, Mark soon finds that the real dangers are already sealed in there with them.