Chevaline - Season 1 - Eps 5: A swiss weapon
After years of investigation, the gendarmes are still facing a mystery. Everything must be started from scratch. A new prosecutor is trying to find the murder weapon, which is quite unique. It is an old Swiss weapon dating back to World War I. Even though it was produced in limited numbers, the search for this weapon is a painstaking task that stretches over months and across multiple countries. Years after the massacre, customs authorities alert the investigation unit: Swiss weapons have been identified, and their owners live near Chevaline. The GIGN is called in for a high-risk arrest—never before have they been so close to their goal.
About Chevaline

Title: Chevaline
First Air Date: 2023-11-15
Last Air Date: 2023-11-22
Status: Ended
Rating: 8/10 (from 2 votes)
Language: FR
Seasons: 1
Total Episodes: 6
Network: Canal+
Genres: Documentary, Crime
Production Companies: Upside Télévision
Synopsis
On 5th September 2012, in a small mountain parking lot in the Alps, a British vacationing family and a local cyclist were found murdered. This marks the beginning of what would become one of the most far-reaching and mysterious criminal cases of recent decades in Europe. While the victims appear to have no notable history, French and British investigators quickly uncover a complex and increasingly perplexing reality.