The Sanatorium: A Novel (Detective Elin Warner Series, Book 1) by Sarah Pearse

In this gripping psychological thriller, Elin Warner, a detective on leave, reluctantly agrees to celebrate her brother's engagement at the eerie Le Sommet hotel, nestled in the foreboding Swiss Alps. Despite her reservations, she joins her estranged brother Isaac and his fiancée Laure, only to find herself consumed by a sense of unease upon arrival.

As a storm rages outside, the hotel's isolation becomes increasingly ominous. When Laure vanishes overnight, Elin's instincts scream danger. With the storm cutting off all escape routes, panic sets in among the remaining guests.

Elin's search for Laure becomes a race against time, but she soon discovers she's not the only woman missing. As the truth unravels, Elin realizes she's the only one who could have foreseen the peril they're all in.

With Reese Witherspoon's endorsement, this atmospheric novel promises to keep readers on the edge of their seats, delivering a chilling tale of suspense and survival in the unforgiving Swiss Alps.