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.

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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.

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Rich, 60-year-old Erika was the victim of a robbery and murder. Since the neighbor saw her grandson leaving the house with a video recorder under his arm, he was the first suspect.

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Inspector Flemming and his colleague Miriam Koch find out that the unknown dead woman - together with other sufferers - lived in a discarded bus. They manage to notify the girl's brother, to whom she regularly sent her savings. Milan appears in Düsseldorf. When he finds out how his sister earned her money, he is determined to avenge her life and death and begins to research on his own.

When Kurt learns that the young Croatian has tracked down the porn photographer Carlos, he fakes a suicide to deceive Milan and the police. But Milan suspects that the photographer is innocent of his sister's death and follows Kurt. But Flemming and Koch have long since seen through his plan for revenge. When the daring boy finally realizes that he has underestimated the two of them, it is almost too late for him.