An idyllic wellness retreat has opened on an island off the English coast, promising rest and relaxation --- but the island itself, known locally as Reaper’s Rock, has a dark past. Once the playground of a serial killer, it’s rumored to be cursed. A young woman is found dead below the yoga pavilion in what seems to be a tragic fall. But Detective Elin Warner soon learns the victim wasn’t a guest --- in fact, she wasn’t meant to be on the island at all. And they would do anything to escape. The longer Elin stays, the more secrets she uncovers. When someone else drowns in a diving incident, Elin begins to suspect that there’s nothing accidental about these deaths. But why would someone target the guests at this luxury resort?

Half-hidden by forest and overshadowed by threatening peaks, Le Sommet has always been a sinister place. Long plagued by troubling rumors, the former abandoned sanatorium has since been renovated into a five-star minimalist hotel. Elin Warner has taken time off from her job as a detective, so when her estranged brother, Isaac, and his fiancée, Laure, invite her to celebrate their engagement at the hotel, Elin really has no reason not to accept. Arriving in the midst of a threatening storm, Elin immediately feels on edge --- there's something about the hotel that makes her nervous. And when they wake the following morning to discover Laure is missing, Elin must trust her instincts if they hope to find her.