During her internship in a remote clinic in the Allgäu region, the young psychology student Lea immerses herself in a mysterious world of unorthodox therapy methods and demonic traditions.

The lawyers Borchert and Kuster are investigating a case involving a young student who has come under the crosshairs of a terrorist group.

After returning from a police mission in Afghanistan, Chief Inspector Harder is set to investigate a bog body found in a village called Friedland. The confrontation with Friedland's brutal history brings a grave guilt from Harder's own past to the surface and forces her to face the echo.