Sans issue : La tuerie de Chevaline

剧情：

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.