When promising young singer Roxy Raines vanishes from the tiny resort of Sandown, the island locals refuse to speak about it to anyone they deem outsiders, instead proclaiming Roxy a teenage runaway.

Thirty years later, seventeen-year-old Mona Perry comes to the island resolute in her search for the real reason behind Roxy's disappearance. Armed with a suitcase and a microphone, Mona only has one hot summer to get to the bottom of Roxy's story and record it all for her podcast and fans.

But as Mona gets drawn deeper into the strange, isolated community, it becomes clear that nothing is as it seems--least of all Mona's own past and the disappearance of someone close to her.