Adelaide was traumatized when she was a little girl. She was in an amusement park: she walked away from her parents and into a mirror maze where she met her exact copy. Many years later she comes to her grandma's house near that ill-fated park with her husband and kids. The woman feels out of sorts, but her husband thinks they should just enjoy themselves in that wonderful place. His opinion changes when four aggressive strangers in red overalls appear in front of the house.