Shortly after a driver has filled up at a Prooil station, his car explodes. Semir and André take on the case. What initially looks like a normal accident takes on a new dimension: a highly explosive additive has been added to Prooil's fuel. When the two detectives pay a visit to the company, they notice that the boss Dr. Pott and his security officer Victoria Götzinger are trying to cover something up. André and Semir suspect that the company is being blackmailed. In fact, they observe Ms. Götzinger handing over money, but it fails. The blackmailer then increases his demands and threatens further attacks. Several cars explode. The detectives want to lure the perpetrator out of his shell by handing over money again. But they are dealing with a clever opponent...