On Halloween, 1968, in the small town of Mill Valley, Pennsylvania, three teen friends, Stella, Auggie, and Chuck, prank bully Tommy Milner. When Tommy and his gang chase them in retaliation, the trio flees to a drive-in movie theater, where a young drifter named Ramón hides them in his car. They invite Ramón to explore a local "haunted house" that once belonged to the wealthy Bellows family, who helped found Mill Valley. Inside, they find a book of horror stories written by Sarah Bellows, who allegedly committed suicide in the house.