An underrated trans-european series that is very enjoyable as long as you don't mind subtitles.
In this dark tale of criminal activity, morality is not simple black and white and although there is much back story it is handled fairly well and provides more emotional impact in the later episodes.
The main players are -
Kahlil, a french detective who has recently returned to Marseille where his mother, sister and criminal brother live.
Milan, one of the diamond heist team who had hoped the proceeds would pay for his brother's operation but instead has to reopen connections with Serbian gangsters.
Naomi, sent by her shady boss (the excellent John Hurt) to retrieve the stolen diamonds. She is then sent from Marseille on to Belgrade against her wishes.
If you can cope with three different languages over the 6 episodes you will be rewarded when the various plot strands come together at the end .