At the entrance to the former NATO center in a cave system, the body of an old man is found. It appears to be a simple robbery and murder, but the case takes a turn when it emerges that the man was convicted of a diamond robbery in Belgium in the 1970s. It turns out that just before his death, the man had contacted his former co-defendants. When the son of an American who served in the NATO cave in Maastricht during those years shows up, it seems that there is more to the story. Especially when it turns out that the loot from the robbery has never been found. While awaiting the verdict against Fleur, Wolf investigates previous cases involving the Hamza family. He speaks to the ex-commando who murdered Coscun's father, but this only sows more doubt in Wolf's mind. When he tries to speak to Gabriel, the ex-commando's friend, Gabriel suddenly seems to have disappeared off the face of the earth. Romeo and Marion help a girl who is being harassed by a homeless man. He stalks her, and Romeo and Marion find it difficult to do anything for her. Fortunately, she has a neighbor who helps her.
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