A homeless man is found dead with bite marks on an industrial wasteland in Berlin. At first, a wolf is suspected of being the culprit. Bonard and Karow chase away a hiker with this information. Before her retirement, Bonard spontaneously accompanies a wilderness teacher into the forest. While she is training there, Karow discovers that it was murder and encounters the mysterious hiker again. The team delves deep into the world of survivalists and preppers.