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Isabelle, the building caretaker, comes to the aid of a wealthy industrialist who has suffered a fainting spell. The latter misunderstands and, thinking he is dealing with a famous novelist, invites her to dinner to thank her. Isabelle accepts as a joke, but they see each other again, and again, and end up falling in love. Isabelle, caught in the turmoil of her feelings, buries herself in lies.