In 1999, teenage sisters Celeste and Eleanor survive a seismic, violent tragedy. The sisters compose and perform a song about their experience, making something lovely and cathartic out of a catastrophe - while also catapulting Celeste to stardom. By 2017, Celeste is a mother to a teenage daughter of her own and is struggling to navigate a career fraught with scandals when another act of terrifying violence demands her attention. An unusual set of circumstances brings unexpected success to a pop star.