After a sudden tragedy left Valerie "Val" Vega completely alone, she channeled her anger and grief into becoming an unmatched musical prodigy. When her best friend Julie loses her own mother and falls into an emotional silence, Val vows to hold the rhythm for both of them. But neither of them expected a dusty 1995 demo CD to summon Luke, Reggie, and Alex—the deceased members of the rock band Sunset Curve. When the ghosts' raw energy miraculously restores Julie's voice, a dynamic new five-piece lineup is born. Balancing Val’s fierce, pragmatic rock authenticity with Julie’s soaring pop-R&B melodies, the girls take the modern music world by storm. But standing in their way is a ruthless high school rival with a family secret, and a dark, hypnotic spirit named Caleb Covington who will stop at nothing to claim the boys' souls for his immortal club.