Tom and Sebastian lead a gang of young wrong-way drivers until a manipulated vehicle leads to a fatal accident. Tom and a truck driver die. Hajo, another gang member, is suspected of having sabotaged the brakes because Tom and Sebastian previously raped his girlfriend. While André and Semir are investigating, they themselves get into a vehicle that doesn't brake and are in mortal danger.

Motorcyclists cause mass pile-ups with crow's feet in order to prepare the release of the gangster Wilken from prison. A traffic jam and an overturned truck are supposed to stop the prisoner transport. André and Semir find out the connection to Wilken and foil the plan at the last second before the release is successful.

Kim asks André for help because she believes that her mother Sonja's partner, Sam, is leading a double life. André and Semir discover Sam's deal with Meffert, but Sam is an undercover agent. When Toni, Meffert's nephew, discovers Sam's identity, he kidnaps Kim and Sonja. André and Semir must now rescue the hostages and protect the undercover mission.

After a mass crash, André and Semir find a body with a gunshot wound to the head in a burnt-out car: the Vietnamese key witness Pnom Pen, who was lured out of a safe hiding place and murdered. The perpetrator, injured in the collision, covered up the murder. André and Semir discover that Pnom's brother Phong La is also a key witness and his life is in danger. They have to save him.

The ex-convict Lennart Nielsen wants revenge on Anna Engelhardt. He terrorizes her, denounces her as an informant and frames her for murder. Finally, he kidnaps her in order to stage her "suicide" and portray her as a fugitive murderer. André and Semir investigate on their own in order to rescue their boss from Nielsen's clutches in time.

A gang of Romanian burglars uses construction machinery for spectacular robberies, including a break-in at a post office with an unusually large amount of cash. André and Semir investigate and come across Müller, an ex-secret service agent, as a possible informant. When an excavator is stolen during the day, the police pursue the gang and engage in a fast-paced chase on the motorway.