John and Doris greet Rebecca and Tyler at the train station. Once they are settled in at their grandparents' isolated farmhouse, Rebecca and Tyler are instructed to never go near the basement because it contains toxic mold. That night, John tells Rebecca and Tyler that as he and Doris are elderly, their bedtime is 9:30 p.m. An hour past curfew, Rebecca ventures downstairs for something to eat and discovers Doris projectile vomiting. Later, Rebecca mentions it to John, who dismisses it as Doris having the stomach flu. John then says that she and Tyler must not leave their bedroom after 9:30 p.m.