The narrative follows a young woman in Los Angeles named Cas, a shy apprentice musician. She recently moved into the house of her late aunt, located in a small town near the city. As she tidies up the place, she manages to open a locked cupboard. She finds an old box full of microcassette tapes, each labeled with cryptic inscriptions. What follows is her investigation and immersion into a world of sounds cataloged in a unique yet surreal way.