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On their honeymoon cruise down the Rhine, Lou (Glynis Johns) and Walt McNamara (Patrick Allen) visit Hahenhausen Castle with Professor Hahnemann (Herbert Lom). Lou, who has been acting strangely all day, is frightened by feelings that she has been in this place before. She demands to see a sealed room, telling the caretaker (George Herbert) where he might locate the key to the door, indicating also that when the door is opened, two skeletons will be discovered. Later, the Professor is able to clear up the mystery of Lou's actions, and she and Walt proceed happily with their honeymoon.