Ulrich starts believing that the disappearances of Erik, Mikkel, and the body of the third boy are related.
While searching the caves, he finds a locked door leading to the nearby nuclear power plant.
Ulrich's request to enter the power plant is refused by its director Aleksander Tiedemann, Bartosz's father.
He is able to clear Erik Obendorf's father, a power plant driver, from his list of suspects.
Police chief Charlotte Doppler is informed that the dead boy, dressed in a 1980s outfit, died only 16 hours earlier, and that his ears were destroyed by extreme pressure.
Later, as lights start flickering and birds fall dead from the sky, Charlotte grows even more concerned.
Meanwhile, an unkempt stranger checks into the hotel owned by Bartosz's mother Regina.
Ulrich's mother Jana lies to Ulrich, claiming that her husband Tronte was with her the night of Mads's disappearance, while knowing he had left their house.
At dawn, a disoriented Mikkel wakes up in the cave and runs home, only to discover that the date is 5 November 1986.