State of emergency in North Rhine-Westphalia! Four inspectors from different departments have already been killed. There has never been a comparable series of murders in the history of the state. But a hot lead is missing, the investigators are groping in the dark - and the pressure is increasing ... Finally stopping those behind the insidious murders - this is the common goal that investigators from different cities are to swear to: All of them have been in contact with the previous victims. Peter Faber and Martina Bönisch from the Dortmund homicide squad and their colleague Nadeshda Krusenstern from Münster are there. The investigation team also includes Inspector Rettenbach from Oberhausen and Inspector Mitschowski from Aachen. Inspector Ziesing is joining them from the Paderborn criminal investigation department, and Inspector Möller is coming from Düsseldorf.

Ballauf and Schenk investigate the murder of a 17-year-old student. [Köln]

A murderer remains at the scene of the crime and demands to speak with Peter Faber.

Falke and Grosz investigate a murder in Hamburg's red light district.

Babs Sprenger, a successful businesswoman who lives alone in a spacious apartment in Fürth, was active on various dating sites under an assumed name until a few months ago. She celebrated her birthday alone with her colleague Theresa Hein. The next day, Babs Sprenger was dead. Stabbed with a sushi knife that the police found in the dishwasher, thoroughly cleaned. The knife was Theresa's gift to Babs. How did it become a deadly weapon? What happened that evening? Even after Theresa's confession, the question of why remains unanswered. Voss and Ringelhahn suspect that the truth lies much deeper. What could Theresa be hiding?

A secret society of law students exercise strange control over a new member.

Not far from her apartment, a youth welfare officer is found murdered. [Köln]

A split-second decision during a standoff sends Lindholm and Schmitz down an Orwellian rabbit hole of conspiracy and deceit.

Lindholm and Schmitz navigate dangerous politcal waters to find the killer of a far-right blogger.

In the middle of an event at the police college, a young student freaks out and stabs her buddy. He still dies at the scene in the arms of the helpless main commissioner.

Detectives Max Ballauf and Freddy Schenk must solve the murder of the head physician of a psychiatric clinic. Ballauf himself is currently undergoing treatment: a trauma he thought he had overcome resurfaces with full force. After shooting his colleague Melanie Sommer during an operation, he is plagued by nightmares and guilt. Sometimes he believes he sees the dead woman before him. He can't talk about it, not even with his partner Freddy Schenk. The atmosphere within the team is correspondingly tense. During their investigation at the hospital, a patient catches Ballauf's attention. Julia Frey claims she is being held against her will in the clinic's closed ward. Deputy head physician Dr. Koch, however, points to Julia's emotional instability. But Max suspects that Julia's cry for help might be justified. [Köln]

Eisner and Fellner investigate the murder of a bodybuilder.

Eisner and Fellner find themselves caught in a war between conventional medicine and alternate healing methods.

Eisner and Fellner investigate the death of a homeless man.