The well-known Dresden scene restaurateur Joachim Benda is found shot dead in his restaurant. For the investigators Karin Gorniak and Leonie Winkler, there is some evidence that Benda was extorted for protection money. Benda's wife Katharina reports that the family was attacked and threatened at home by masked men. Police are able to link one of the bullets from the crime scene to a weapon previously used in a red light murder. The matter is clear , especially for Commissariat Manager Schnabel, who knew and respected Benda and who wants to clear up the tragic murder case quickly. But when the testimony of an undercover investigator raises doubts about Benda's mafia connections, Katharina Benda becomes the focus of the investigation again.
The detectives find out that Benda wanted to have his wife admitted to a psychiatric ward. But her alibi for the crime night is complete. In order to uncover the truth, Gorniak and Winkler seek access to Viktor Benda, the couple's older son, who is increasingly being pressured by his mother.