The Sanatorium by Pearse, Sarah

You won’t want to leave. . . until you can’t.

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.

An imposing, isolated getaway spot high up in the Swiss Alps is the last place Elin Warner wants to be. But Elin’s 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.