Fact1: Casey is travelling to spend New Year holiday at secluded home of Elaine 's sister, Fact2: Nicky and Leah begin to show symptoms of illness, Fact3: Robbie takes rest of children outside to play in snow, Fact4: children scream drawing attention of Casey Jonah Elaine and Chloe, Fact5: Paulie runs off before luring Elaine to climbing frame and breaking leg
Output: Casey, a rebellious teenage girl, is travelling with her mother Elaine, her stepfather Jonah, and her two younger halfsiblings, Miranda and Paulie, to spend the New Year holiday at the secluded home of Elaines sister, Chloe. Chloe, her husband Robbie, and their two young children, Nicky and Leah, welcome their visitors. Shortly before arriving, Paulie begins vomiting, which the adults believe is due to travel sickness. As the night progresses, Nicky and Leah also begin to show symptoms of an illness. Leahs vomit has strange bacteria in it. As everyone goes to bed, the family cat, Jinxie, goes missing. Casey, back at the woods, makes plans with her friends to escape and attend a party when she hears Jinxie snarl. However, she is not able to locate the cat. By the next day, all of the children have become infected. At dinner, Miranda becomes violent, scratching Chloe and ruining the food. While Jonah tries to comfort Miranda upstairs, Robbie takes the rest of the children outside to play in the snow. Nicky places a garden rake in Robbies path while he is sledding, which slices open Robbies head on impact. The children scream, drawing the attention of Casey, Jonah, Elaine, and Chloe. Elaine phones an ambulance, but Robbie quickly dies from his injuries. Paulie attacks Jonah with a knife and runs off before luring Elaine to a climbing frame and breaking her leg. Casey rescues her and they seek refuge in the greenhouse which is attacked by the kids. Paulie attempts to kill them but is fended off by Casey who convinces Elaine something is wrong with the kids. Chloe finds Robbie’s body has been dragged into the children’s play tent where it has been mutilated with toys, she is then attacked by Leah and is saved by Casey. Chloe panics, blaming Casey for what is happening before fleeing into the house while Casey returns to the greenhouse and saves Elaine who in turn saves Casey by killing Paulie. Jonah finds Paulie dead. The group enter the house where Chloe accuses Casey and Elaine of going insane when Casey says Elaine killed Paulie to save her. Jonah and Chloe abandon them in anger and leave to find Chloe’s kids. Casey starts barricading the house and Jonah and Chloe are separated in the woods, Chloe is attacked by her kids and stabbed in the eye with a crayon, killing her. Casey finds Miranda beating the dead cat in the bedroom and attacks her; Jonah is tricked by Miranda into believing that Casey attacked them, and he locks Casey in the bedroom before leaving with Miranda in the car. In the house, Elaine is attacked by Leah and Nicky but is unable to hurt them due to them being kids. Casey breaks out of the bedroom and kills Nicky, saving Elaine while Leah flees into the woods. Casey and Elaine flee the house and find Jonah dead by Chloes crashed car. As Casey investigates Jonahs body, Miranda suddenly attacks her. Elaine rams Miranda with the car killing Miranda and saving Casey. Elaine noticeably observes Casey vomiting before Casey gets in and Elaine drives away from the house. As they drive, various infected kids, including Leah, emerge from the woods. As Elaine panics, Casey starts staring into space like the infected children did and the film ends leaving the audience wondering if Casey has become infected.