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

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.

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.

Claudia reveals to Adam how everything is connected — and how he can destroy the knot.