"The Hunting Party" written by Lucy Foley. The storyline itself is quite enclosed and is over a period of only a few days, so the level of detail in the story is higher than a lot of other books of similar type. It is a fast paced book and best to read over a short period of time, ideal for those winter days with a good cup of tea.

All Elin and her Partner Will wanted to do was go on a nice Winter Holiday in Switzerland to see her Brother and his Fiancée for the first time after 5 years. That´s when it starts to get fearful and gets you sucked in. The Thriller "The Sanatorium" by Sarah Pearse had me from the first page.