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Finja's father Peter is attacked by a ghostly apparition, which he hides from his daughter. Meanwhile, Ruben and Romy find themselves in danger at Poppenberg.
After the stressful encounter with the comatose artist Bruno Mannheimer, the father of Jannik and Sam, the brothers rebuild his light and sound installation.
When they meet, Christian gives Finja a crucial clue as to how the Pied Piper can be stopped. The adults of Hamelin play an important role in this.