The Sanatorium

An imposing, isolated hotel, high up in the Swiss Alps, is the last place Elin Warner wants to be. But she's taken time off from her job as a detective, so when she receives an invitation to celebrate her estranged brother's engagement, she accepts.
Though it's beautiful, something about the hotel, recently converted from an abandoned sanatorium, makes her nervous. And when her brother's fiancée vanishes, Elin's unease grows.

When the storm cuts off access to and from the hotel, and another woman goes missing, Elin realises just how much danger they're all in.