Antwerp is in turmoil: the impregnable diamond mecca has been broken into. The whole world demands answers. Who would be so bold as to pull off the "heist of the century"? Amidst the agitated clients of the Diamond Center, there stands Leonardo Notarbartolo. Depending on who you ask, he's either a modest Italian jeweler, or the greatest thief in the world.

Locked in his cell, Leonardo tries to put the puzzle pieces together and wonders which one of his team members betrayed him. Perhaps his long-time friend Ghigo, the alarm expert? Or Sandra, the lock-picking prodigy? Could it even be Alberto, his hacker stepbrother?

While Leonardo strikes a secret deal with the shady lawyer John Lovegrove, the chief of the Diamond Police, Albert Mertens, follows a new lead involving someone inside the Diamond Center.

Being romantically involved with a thief isn't easy. Anna, Leonardo's wife, is well aware of this as she finds herself cornered by Mertens. Judith Dewitt, the director of the Diamond Center, also comes to regret her involvement with Leo when she finds herself in the crosshairs of the investigation. Meanwhile, a mysterious man keeps a close eye on Leonardo.

The news of Leonardo's extramarital affair hits Anna very hard. Anna, however, is not the only one feeling betrayed-there is evidence of who betrayed Leonardo.

While Mertens receives a tip-off that he just can't ignore, Anna sets her plan for revenge in motion by moving to take away the only thing keeping Leonardo alive. Checkmate.

Thanks to a tip-off, Mertens launches a huge police operation. Gerald Kahn still has his eyes on Leo.

Once out of jail, Leo starts to get the pieces moving again, while the rest of the gang and Gerald Kahn are about to retrieve the diamonds. Everybody wants them. But the King of Thieves is free again, and he has a surprise in store for them all.