It's a mark of desperate times that they've returned now, and the heist sparks a series of investigations across Europe, with Morton's insurance investigator Naomi, her boss Tom (John Hurt) and passionate young French police officer Khalil (Tahar Rahim) teasing out a complex web that runs across Britain, France, Serbia, and Bosnia.
What starts with diamonds, leads to guns, drugs, high finance and involves the corridors of power in the EU, the City of London and the murky web of Europe's criminal underworld.
Through the eyes of our main characters we travel back and forth between the dark days of the 1995 Balkan conflict and the evolution of organised crime in Europe, to the modern world of gangsters and Eurobanks, and a new breed of criminal - the "Banksters".
It crosses languages, classes, cultures, resulting in a six-part modern day thriller that melds politics, passion, and commentary on the state of Europe - plus it has a theme tune by Bowie.
Tune in
Where: Rialto Channel
When: Tuesday, 8.30pm
What: More than a diamond heist thriller series