Over thirty years ago, young and promising singer Roxy Raines disappeared. The people of her hometown, the tiny island resort of Sandown, are reluctant to talk about it, proclaiming Roxy as a runaway. Seventeen-year-old Mona Perry is convinced there's something more sinister at play. Armed only with a suitcase and a microphone - to record her findings for her podcast's listeners - this runaway teenager has one hot summer to get to the bottom of the disappearance. But as Mona gets drawn deeper and deeper into the strange goings on of this isolated community, it is clear that nothing is as it seems - least of all Mona's own past . .