When a bomb detonates beside the highway and nearly kills two road workers, Frank Stolte and Ingo Fischer of the Autobahnpolizei are called to investigate. What they find is a recorded message of a blackmailer who calls himself 'Rascar Capac', the arch villain in the 'Tim and Struppi'-Comics. He wants a million, or he will blow up more bombs. When the money transfer fails and the methods of the blackmailer get more and more brutal, the two investigators can only ask another bomber for help, who is now in prison.