A male body is found in a wooded area next to the motorway. It looks as though he was literally executed. The investigation reveals that the perpetrator is obviously a woman who the dead man, Matze, picked up as a hitchhiker. André and Semir reconstruct Matze's last journey. At the gas station where the dead man was last seen, they come across important clues: the perpetrator is apparently the young gas station attendant named Anna Terjung. While they are still looking for a connection between the victim and the perpetrator, another murder occurs. André and Semir are now convinced that they are on the trail of a serial killer and believe that this is Anna. But when they get to their gas station, Anna has disappeared without a trace. A feverish search for the perpetrator begins.
