The surprising and hilarious situations that erupt in a luxurious, peaceful hotel in the mountains of Petrópolis when a mysterious "Lady in White," a woman covered by a long veil, begins visiting the rooms of unaccompanied men in the dead of night. In the midst of this commotion, Renato, a doctor from Rio de Janeiro who fancies himself a Casanova, and his well-behaved wife arrive to spend a vacation at that very hotel. Faced with her husband's suspicious behavior, she decides to change her personality and, to teach him a lesson, takes advantage of the madness gripping the hotel to become her own husband's irresistible Lady in White.