Senta von Meissen invites the fellow students of her graduation class from 1938 - 50 years ago - for a class reunion into her castle. They expect to happily party through the weekend - but that's not what their host intends for them. A foreboding steals upon Senta's visitors, when there remains an empty seat at the dinner table, preserved for a student, who came to death during one of their scholar excursions.