佛兰克·什耶夫斯基被老友克鲁德约到了一家酒吧里，并告诉他有一桩大买卖，辖区的警察向他透露这里藏有价值8000万法郎的钻石，如果他们能得到钻石生活就将没有后顾之忧。在克鲁德的策划下，他们闯入酒吧里有人把守的一间后屋，击毙了几个人之后，他们顺利地得到了整箱钻石，但他们走出酒吧的时候却遭到了伏击。

Forced out of his elite unit, a troubled cop launches his own rogue investigation when mysterious killings claim the lives of his former colleagues.

Follows Sara, head of the Toulouse police narcotics squad, who is forced to collaborate with Richard, the head of the local criminal police, to stop a go-fast between Spain and France and find the murderer linked to the case.

After growing up in a poor gypsy camp, Edmond Vidal, aka Momon, has retained a sense of family, unfailing loyalty and pride in his origins. Most of all, he has remained friends with Serge Suttel, with whom he first discovered prison life - for stealing cherries. The two of them inevitably got involved in organized crime. The team they formed, the Ganf Des Lyonnais, made them the most notorious armed robbers of the early 1970s. Their irresistible rise ended in 1974 with a spectacular arrest. Today, as he nears 60, Momon would like to forget that part of his life. He has found peace by retiring from the "business". He tends to his wife Janou, who suffered so in the past, and to his children and grandchildren, all of whom have great respect for this man of simple and universal values, so clear-headed and full of kindness. But then Serge Suttel, who has disowned nothing of his past, comes back into the picture.