The year is 1973. Little Tommy teases his sister, Maisie, claiming she has a disease he heard from school--a well-known disease called the cooties. However, Maisie, a few years older, is well aware of this false disease, having already been teased during her time in the same grade. Exhausted by the childish game, she chases Tommy through the house and pushes him against a wall, creating a small crack between the wooden boards. After Tommy runs to their mother, Maisie notices the small hole, but even stranger, a hidden room beyond it. Peering inside, she sees a small box with a tunable handle. "A music box?" As Maisie forms the thought, her eyes spot strange markings along the walls. At first, she assumes they're