Confidentially Yours

Julien Vercel and Massoulier are hunting by the lake when Massoulier is shot dead. Julien returns to his office unaware of the murder, but soon becomes the prime suspect. The police focus on him because of suspicious clues left at the scene, including a parked car and fingerprints on a door.

The police interrogate Julien and learn that he left Massoulier's car with its lights off to save the battery, and that he touched a door leaving a fingerprint. This evidence points to him as the leading suspect. The atmosphere is tense as his alibi begins to crumble.

When confronted at home, Marie-Christine nonchalantly confirms the adulterous relationship with Massoulier. Julien is stunned by the betrayal, which adds motive to the unfolding case. The personal stakes become as important as the legal ones.

Julien is taken back for a second interview but is released thanks to his lawyer Clement. Clement drives him home after presenting a possible path to proving his innocence. The fragile peace is short-lived as new clues emerge.

Marie-Christine is found dead, turning the investigation toward Julien, who already faced public suspicion. The combination of her death and his discovery of the affair amplifies the sense that Julien may be involved. The police shift to treating him as the main suspect.

Rather than surrender, Julien hides in his real estate office to avoid the police stakeout. Barbara Becker, his secretary, begins to plot secretly, preparing to gather information that could exonerate him. The cat-and-mouse game expands as the investigation widens.

Barbara is assigned to research Marie-Christine's past life and travels to Nice to conduct her inquiries herself. She keeps her distance and pursues leads that the official investigation misses. Her covert trip marks a turning point in the defense.

In Nice, Barbara learns that Marie-Christine's real name is Josiane Kerbel and that she had a history of gambling and debts. She discovers that Marie-Christine married Vercel to avoid bankruptcy, revealing long-hidden motives. These revelations link past crimes to the present case.

The clues take Barbara and Julien from a movie theater to a nightclub and into the shadowy prostitution districts. They trace connections between Massoulier, Marie-Christine, and the people around them. Along the way they accidentally confront a man they mistake for the killer, who turns out to be Massoulier's brother.

At the theater, a box office clerk who had accused Julien of murder on the phone is stabbed to death. The victim is revealed to be a former lover of Massoulier, adding another layer of mystery and danger. The killings escalate as the web of lies tightens.

Barbara confronts Julien's lawyer and discovers that Clement and Marie-Christine were lovers. The revelation reframes the motive behind the crimes and hints at a deeper manipulation. It casts doubt on earlier testimonies and complicates Julien's defense.

Barbara's investigations reveal that Clement killed Massoulier at Marie-Christine's request, then killed Marie-Christine for not divorcing Julien, and killed the clerk because she knew too much. The scope of Clement's actions shows him as the true architect of the tragedy. Julien's fate hinges on proving Clement's crimes.

Clement senses the trap being sprung and, after admitting everything on a phone call, commits suicide in a telephone booth when the police close in. The confession comes too late for direct justice, but the truth is finally exposed. The case moves toward its final resolution.

Barbara and a savvy police officer coordinate to seal the case, ensuring Clement's culpability and clarifying Julien's acquittal in the eyes of the law. The tangled web of lies is untangled, and the real killer is confirmed beyond reasonable doubt. The investigation reaches its logical conclusion.

Julien and Barbara finally marry, celebrated by Massoulier's brother, who serves as the clergyman. The couple finds a sense of closure after a maze of deceit and murder. The ending ties together personal forgiveness with the strange, murky web of the case.