Stefan Hausmann, a former false witness, is hit by a truck while driving on the highway, shortly after receiving an anonymous phone call. The caller, Erik Dekker, accuses himself of murdering Hausmann. Dekker, who was wrongly convicted years ago for the murder of a gas station attendant, now seems to be embarking on a campaign of revenge. Tom and Semir are unable to prevent the assassination attempt on public prosecutor Wolf, who is seriously injured. Dekker eventually kidnaps the last witness and Engelhardt, whose life is now also in danger.