Someone has managed to break into the Diamond Center in Antwerp. The chief of the Diamond Police, Albert Mertens, starts following all possible leads. An Italian jeweler, Leonardo Notarbartolo, ends up in prison; his name has been found on a receipt in a garbage bag containing some of the tools used for the heist. Leonardo was the mole inside the Diamond Center, and now he wonders which one of his team members betrayed him: Ghigo, the alarm expert; Sandra, a lock-picking prodigy; or Alberto, his hacker stepbrother? Pressured by the lawyer John Lovegrove, who on behalf of his clients is trying to get Leonardo to reveal where he stashed the loot, Leonardo says he will only tell him in exchange for his freedom. In the meantime, the investigation leads to Judith Dewitt, the director of the Diamond Center. Leonardo gained her trust to obtain the maps of the vault prior to the heist. At first, Leonardo’s wife, Anna, doesn't know that her husband is a thief, but when she finds out she accepts it on one condition: that he let her take part in the heist. That's until she discovers his entanglement with Judith De Witt. Lovegrove keeps pushing Leonardo, unaware that a mysterious man, Gerald Kahn, is watching them from a distance. Alberto finds proof that it was Ghigo and Sandra who betrayed Leonardo. Anna takes her revenge: she goes to Alberto and tells him that Leonardo ordered her to retrieve the loot to ensure that Ghigo and Sandra can never get their hands on it. Mertens, convinced he’s just one step away from cracking the case, launches a massive police operation against the Indian community of diamond dealers. However, it turns out to be a false lead devised by Lovegrove in order to get Leonardo out of prison. But before Anna, the gang, or Lovegrove get their hands on the diamonds, Gerald Kahn reveals his hand: he wants the diamonds too. Leonardo, however, has hidden them in a secret location. Anna must now decide whether to forgive him and enjoy a millionaire future together, or enjoy it on her own.
