Chief Detective Bernd Flemming, Inspector Mariam Koch and Chief Inspector Max Ballauf have their hands full while the carnival is in full swing in Düsseldorf.

Joest is kidnapped after a rendezvous with his lover Ute Vonhoff; his driver is killed in the attack. A kidnapper likes to humiliate Joest. A renewed attempt to blackmail the family convinces the inspector that Joest is keeping a secret.

Two men break into the Düsseldorf building authority with the help of an employee. When they are surprised by the security guard while taking photos of site plans, they kill him and fake a robbery and murder.