As Rath takes part in a risky experiment, a brutal gang war breaks out in Berlin; widow Behnke tries to help Katelbach; Toni finds herself in danger.

Martha meets the Stranger and learns his true identity. Claudia tries to prevent Egon’s death in 1987. Hannah travels to 1954 to see Ulrich.

Charlotte and Ulrich try to piece together what happened in the bunker. In different times and worlds, Jonas and Martha work to gain each other’s trust.

Six months after the disappearances, the police form a task force. In 2052, Jonas learns that most of Winden perished in an apocalyptic event.

In 2019, Jonas emerges from the cave into a strange but familiar world: the town of Winden, reeling from the recent disappearance of a young boy.

Ulrich looks to the past for answers and dredges up disturbing family secrets. Armed with new tools, Jonas probes the cave’s murky depths.

When a grim discovery leaves the police baffled, Ulrich seeks a search warrant for the power plant. A mysterious stranger checks into the hotel.

In 2019, a local boy’s disappearance stokes fear in the residents of Winden, a small German town with a strange and tragic history.