Twelve-year-old Karli moves to Bad Gastein in the Alps, where his parents are restoring their hotel. While exploring, he discovers an old lift that stops on a mysterious mezzanine floor—where it’s still 1938. There, he befriends bright Jewish girl Hannah and young shoeshine boy Georg, forming an inseparable trio. When Georg is wrongly accused of theft, the three friends set out to uncover the real culprit—and in the process, stumble upon strange and unsettling secrets lurking within the hotel.