One day Chantal receives an anonymous love letter, “I follow you around like a spy – you are beautiful, very beautiful,” states the first. As the anonymous love letters continue, Chantal undergoes a subtle transformation. She dresses up, she is much happier, her love to Jean-Marc intensifies. But the anonymous letters also divides the lovers, as Chantal harbours a secret and Jean Marc knew about the secret and is hurt that Chantal takes so much delight in it.
You see, those letters are sent by Jean-Marc, an attempt to boost his lover’s confidence. When Chantal says nothing of it to him, Jean-Marc is troubled by her lack of disclosure. Jean-Marc is hurt that she was so receptive of what she thought was another man’s affection, and she is hurt that he would deceive her. Misunderstandings pile on and instead of a gesture that reinforces their love, separates them.
The novel becomes increasing surreal. As Kundera blurs the line between dream and reality towards the end of the story.