After an innocent young girl is killed during a heart-pounding diamond heist, English loss adjuster Naomi is tasked with recovering the gems, much to the annoyance of Parisian cop Khalil, who is more concerned with solving the girl's murder.

Tom vows to find the missing jewels while Naomi questions a lead who is already behind bars in Belgium. Milan, meanwhile, is eager to get his cut of the diamond profits, and Khalil leans on the victim of a home invasion.

Naomi tracks a well-known diamond dealer, Tom is desperate to provide the insurance cover for the lucrative new airport project, Khalil is ordered to focus on a new case and Milan makes a noble decision that could have terrible personal consequences.

As Khalil strikes a dangerous deal with his brother Mokhtar, Milan puts himself at risk to protect his own sibling. Naomi makes a key discovery in her pursuit of the diamonds, but has trouble getting Tom to take her findings on board.

1995, and as war-torn Bosnia breathes in the uncertain safety of a delicate cease fire, a significant connection between Naomi and Milan is revealed.

Naomi desperately tries to protect Milan who is hell-bent on revenge. Mokhtar tries to convince his brother that they have incited a gang war, and when his loose-cannon sibling goes rogue, Khalil is forced to admit that they are in deep trouble.