In 1905, Pietro Neri, who hails from a small Italian farming community, arrives at the Grand Hotel, a luxurious hotel and spa in a splendid valley among the Dolomites.  Pretending to be a servant, he is really there to discover what happened to his sister Caterina, who has gone missing.  His path crosses with that of Adele Alibrandi, the aristocratic daughter of the hotel's owner. Their class differences will not keep the youngsters from falling in love and discovering the truth about Caterina and the mysteries surrounding her disappearance.