When fledgling singer Roxy Raines vanishes from the tiny resort of Sandown, the island's locals refuse to talk about it to any outsiders, dismissing Roxy as a teenage runaway. Thirty years later, seventeen-year-old Mona Perry is convinced there's something more sinister at play. Armed with a suitcase and a microphone - to record her findings for her podcast's listeners - the troubled teen is on a deadline: one hot summer is all she has to get to the bottom of Roxy's story. But as Mona gets drawn into the strange goings on of this isolated community, it becomes clear that nothing is as it seems. Least of all Mona's own past, and the disappearance of someone else, someone much closer to her... How far will she go to uncover the truth?