A Halloween party turns into chaos when real zombies appear, forcing y/n to flee into nearby fields. She’s nearly attacked before being rescued by a group of siblings who bring her to their secure, isolated home. After her parents join them, she’s placed in a reinforced treehouse to stay with one of the brothers, Grayson. As he shows her around, the shock of what’s happening begins to settle in. Though the treehouse feels safer than the outside world, the distant sounds beyond the walls are a reminder that everything has changed - and this is only the beginning of their fight to survive.