In the 500th episode of "Grostadtrevier", the past comes to life again - and the present ends. The "Repsold", the ship on which Dirk Matthies left for the big wide world, runs aground in the port of Hamburg. Not with Dirk, but with Merceds de Silantro from Colombia on board. The news of their arrival causes nervousness in the neighborhood: Merceds' father and Karl Dostal, a former neighborhood patron, committed a serious robbery almost 20 years ago, which caused the two families to quarrel. There is still no trace of the loot to this day. Merceds and Karl's son Roman had sworn eternal love to each other back then. After 20 years, they meet again, knowing full well that one of their fathers has cheated on the other. A new neighborhood war breaks out, which the PK 14 team must stop. There is exactly 1 day, 14 hours and 52 minutes left to find out where the loot in the form of gold dust is hidden. Otherwise, the statute of limitations applies and no one can be held accountable. Even though he is far away, it turns out that Dirk Matthies set up the whole story on time... The NDR Vokalensemble makes a guest appearance in the 500th episode to mark the anniversary: to show solidarity with member Roman after his arrest, the ensemble sings the prisoners' chorus from Verdi's opera "Nabucco" in the police station.