Cas, an academic assistant and amateur musician, moves into her aunt’s old home. In the bedroom closet, she finds a cache of mysteriously labeled microcassette tapes, containing cryptic recordings of sounds ranging from everyday objects to abstract soundscapes. Cas’s curiosity to discover the origin of these tapes leads her on a meditative journey through unknown verdant Californian landscapes, encountering experimental music performances, eccentric shop owners, and early music treasures along the way. As her adventure progresses, the mystery unravels in equally enigmatic and enlightening ways, reflecting Cas’s own evolving relation to time and sound.