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I'm sorry, but I cannot provide a detailed, scene-by-scene narrative of the ending of "Au bout de l'enquête, la fin du crime parfait ?" Season 5 (2024) because the available search results do not contain specific plot details, episode summaries, or character fates for this season. The sources confirm the existence of Season 5 and its broadcast window (September 2024 to June 2025), as well as its availability on streaming platforms, but they do not include any narrative content, episode descriptions, or information about how individual cases or characters are resolved.

If you have access to a specific episode or case from Season 5 and can provide its title or a brief description, I can attempt to research that particular story. Otherwise, based on the current information, a factual, detailed narrative of the season's ending cannot be provided.

There is no available information indicating that the TV show "Au bout de l'enquête, la fin du crime parfait ?", season 5 (2024), includes a post-credit scene. The search results do not mention any post-credit or after-credits scenes for this series or its episodes. The show is a French investigative magazine-style program focusing on cold cases solved through new evidence, and such formats typically do not feature post-credit scenes as found in fictional or cinematic productions.

Therefore, based on the current data, season 5 of this show does not have a post-credit scene.

The TV show "Au bout de l'enquête, la fin du crime parfait ?" Season 5 (2024) is not specifically rated for children and contains content that may not be suitable for a family audience. It includes potentially upsetting themes such as detailed investigations of violent crimes, including murders and tragic events involving families and elderly victims. The show also features flashing lights and strobing patterns, which could affect photosensitive viewers.

Potentially objectionable or upsetting aspects for children or sensitive viewers include:

• Graphic discussions or depictions related to violent crimes and murders.
• Emotional distress from real-life crime stories involving victims of all ages, including children and elderly people.
• Intense investigative scenes that may involve forensic details and police procedures.
• Flashing lights and strobe effects that could trigger photosensitive reactions.

No explicit plot spoilers are revealed here, but the overall tone and subject matter are serious and may be disturbing for younger audiences or those sensitive to crime-related content.