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The small german town of Winden is shook by the disappearance of a teenage boy. While the townsfolk are occupied with secrets of their own, at nightfall a group of teenagers try's to recover something the missing boy may have left behind.
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When a grim discovery leaves the police baffled, Ulrich seeks a search warrant for the power plant. A mysterious stranger checks into the hotel.
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It's 1986, and Ulrich's brother, Mads, has been missing for a month. Confusion reigns as past and present intertwine.
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Bizarre occurrences give Charlotte a sense of déjà vu, and she suspects Peter is hiding something. Franziska snaps when Magnus confronts her.
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Hannah takes her obsession with Ulrich too far. The stranger asks Regina to deliver an important package. Martha is torn between Jonas and Bartosz.
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Ulrich looks to the past for answers and dredges up disturbing family secrets. Armed with new tools, Jonas probes the cave's murky depths.
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Ulrich questions a frail and frightened Helge in the nursing home. Jonas searches for Mikkel, but the stranger warns him about meddling with the past.
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In 1953, the disfigured bodies of two boys are exhumed at a construction site, the future location of Winden's nuclear power plant.
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Ulrich runs afoul of the law, Helge tries to dodge Egon Tiedemann, Claudia harnesses the cave's powers, and Katharina lashes out at Hannah.
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Peter gets a shock. Jonas learns the truth about his family, but there are more surprises still to come. Helge makes a sacrifice.