Lucie and Lucien, both in their mid-twenties, have lived together for years. Lucien flunks an exam to become a policeman, but is promoted to be a secret agent instead. The cover he is assigned to hide his real job from the world, including his loved ones, is that of a social butterfly. While posing as this in the line of duty, he meets a young woman, Jennifer, who takes him for an arch-seducer, and therefore the ideal man to initiate her sexually. Meanwhile, Lucie is upset by Lucien’s sudden transformation into a party animal, and also by a recurring dream that wakes her up every night. She starts having doubts about their relationship. Influenced by a guru psychologist and wanting to develop a deeper and more sincere rapport with Lucien, she decides that they must tell each other everything. Trouble is, Lucien is sworn to professional secrecy — and there’s Jennifer, too. He just can’t do it!